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Focusrite Scarlett Gen 3 4i4 (and others)

https://linuxmusicians.com/viewtopic.php?t=20669

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Really need sum help to get my focusrite 4i4 running(Got linux mint and working with Ardour)

Posted: Fri Apr 24, 2020 12:31 pm
by doro
Hey Everyone. Please can you tell me how can i get my focurite 4i4 to run.im pretty new to this.just started to set up my own studio at home.Id be very happy for help and suggestions.Thank you
greetings from doro

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Wed Apr 29, 2020 3:01 pm
by davemiller72
Hi all,

I'm running Ubuntu Studio 19.10 (20.04 when I get round to updating) and am torn between a Behringer UMC404HD, or taking a punt on a Scarlett 4i4.
My laptop only has USB3 ports, so I don't know if either are going to work properly.
But anyway, I digress... I have a decent amount of professional software development experience - mostly Windows C++/C#/.NET, but I'm playing around with C#/Mono/GTK# on Linux at the minute and I've done hardware control software in the past.
So if I can help out on any development/testing I'd be happy to.

Cheers,
Dave.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Wed May 06, 2020 6:14 am
by clovis
geoffrey wrote: ↑Mon Nov 11, 2019 6:15 am Hi all,

A really generous guy just out of the blue purchased me a Scarlett 4i4 Gen 3 as a thank you for writing the Scarlett Gen 2 Linux driver. Of course I right away had a look as to its Linux compatibility and whether I'd be able to write a Gen 3 driver. Here's what I found...

TL;DR: The class-compliant functionality works great in Linux! If you need the MIDI interface, take it out of MSD mode. My Linux driver to control the proprietary features is coming along well.

In detail:

Out of the box it comes in "MSD Mode" which means the device presents a small read-only virtual disk in addition to the PCM audio interface. On the disk there is a README file and a link to the Focusrite web site setup/registration and download page; the device serial number is included in the link to make it easier to register.

The Focusrite docs say that higher sample rates and MIDI functionality are not available until you switch it out of MSD mode. I can confirm that the USB MIDI interface was not present while in MSD mode, but I could select higher sample rates without issue.

Taking it out of MSD mode can be done with the Focusrite Control software, or by holding down the "48V" switch for 5 seconds after plugging in the USB cable. You only need to do this once.

The mixing/routing features of the unit, and the impedance, air, and pad switches can only be controlled by software using a proprietary protocol. The Gen 3 protocol is really similar to the Gen 2 protocol, so I have a working implementation already and can control: Volume, Routing (including Loopback), Mixing, Air, Impedance (Line/Inst), and Pad. It's rough and not ready for release but it works! So, let me know if you have a 4i4 unit and would like to help test it out while I'm still developing the driver.

If the 8i6, 18i8, and 18i20 devices follow the same pattern (there's no reason to think that they wouldn't) then I'd just need access to the hardware to develop and test a driver for them. So if you would like to donate in some way towards this, please let me know.

Regards,
Geoffrey.
Hi Geoffrey,

Recently, I got a new Scarlett 18i20 3rd Gen device, in addition to the 2nd Gen I still use. With 2nd Gen, I was very happy with your work on Linux system, since I needed output volumes control. Unfortunately I'm not able to use the same driver for 3rd Gen... You said only a few changes in protocol were required, and that's good news I guess!

Would you like me to provide you with some information on this device?
Would you share your sources so that I can test it, or is that too soon for now?

Regards,
Clovis.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Thu May 07, 2020 11:52 am
by GuitarNoob
Geoffrey,
I just acquired a 3rd gen 18i8, if there's any information I can give you that would help your efforts just let me know. Thanks.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Fri May 08, 2020 12:36 pm
by triiif
GuitarNoob wrote: ↑Thu May 07, 2020 11:52 am Geoffrey,
I just acquired a 3rd gen 18i8, if there's any information I can give you that would help your efforts just let me know. Thanks.
in the mean time you could help puleglot with your output to lsusb : :D
viewtopic.php?p=117456#p117456
In this thread you'll find a patch that fix crackling audio that works great for my 4i4, cracklings happen only in a DAW. But puleglot is not confident enough yet, he needs to gather all the scarletts 3gen identificators.
thx

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Sat May 09, 2020 4:35 pm
by davemiller72
Ok, so I went for the Scarlett 4i4 (because it was available right now and who wants to wait for new toys :D ) Initial findings as follows:

1. System and use case
OS: Ubuntu Studio 19.10
Kernel: 5.3.0-51-lowlatency
Plugged in to a USB3 port and running Jack

I am basically sticking 2 dynamic mics in the front using XLR and two electro-acoustic guitars in the back using TS cables. So I don’t need to switch between line/instr levels right now, but I'll probably want to use the electric guitar at some stage.
I don’t use MIDI much, other than a USB keyboard, so the in/out ports on the back of the 4i4 are of little interest to me personally.

2. Does it work?
1. Yes: I can plug it in and get signals to Ardour; Inputs and outputs show up in Carla (6 ins, interestingly, 4 outs)
2. JACK started using Ubuntu Studio Controls. (I’ve tried it successfully with QjackCtl too, now I have some sort of idea how that works - knowledge increasing hourly!)
3. QASMixer lists the Scarlett, but if selected nothing shows. Sometimes crashes.
4. Pressing 48V for 5 seconds didn’t drop it out of MSD for me.
5. I couldn’t access the built-in drive, even though it showed up in File Manager.
6. So I went and did the setup on Windows which switched it out of MSD. And I registered the device with Focusrite while I was at it.
7. The control software is underwhelming. If it was more like the control software that came with my Saffire Pro 24 then I could see why they wouldn’t want to develop it for a third OS, but this looks pretty simple software. Anyway, Focusrite can support what they want I suppose, but Mono and a web-based interface would make it practically 1 build for 3 systems. Almost.
8. Anyway, taking it out of MSD didn’t break the thing - all 4 inputs were still functioning on Ubuntu.
9. Signal was a bit low on inputs 3 & 4 on the rear (this was with the electro-acoustic guitars plugged in and yes the batteries were fine in the preamps). The 404HD has physical gain controls for inputs 3&4, but I got Jack Mixer to boost those signals. Seems to work ok. No doubt there is a much better way to do this.
10. I can’t get any signal to the headphones jack (guessing internal routing?)
11. I seem to be able to get a signal to an external speaker / monitor from outputs 1 & 2 but not 3 & 4, regardless of any messing about in Carla. This may just be default internal routing setup in the Scarlett.

I am happy to admit that at least some of the issues above are down to my lack of knowledge of JACK, Carla and Linux audio in general (I’m a bit new here)

3. What am I missing?
Obviously, being able to mix the internals for zero/low-latency monitoring would be great, but it’s not a big thing for me at the minute. Later in the year when I’m planning on doing some recording, then yes it would be helpful.
Getting a signal to the headphone output would be really very handy!

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Sat May 09, 2020 7:30 pm
by davemiller72
Quick followup:
When I had stopped messing about with JACK, I shut it down and I could get sound from the computer (YouTube etc) out of the Scarlett headphone jack and outputs 1 & 2. The Scarlett was showing up as an input and output device in Pulse Audio - so it should be possible to get DAW signal out of the Scarlett somehow when JACK is running again...

Also, the 20.04 upgrade arrived and took Jack Mixer away from me... so I'm sending the two guitars through Carla with a gain plugin to boost the signal. That means I can't use Carla for compressors for the vocals I guess, as I don't want to increase gain on the vocal signals.

Any thoughts on either of these things would be appreciated....

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Sun May 10, 2020 8:03 pm
by davemiller72
OK, yet another quick update. Returned to the new setup today and I seem to have output of DAW playback to both the headphone jack and outputs 1&2 on the rear (external speaker). I'm guessing user error yesterday... I probably had the routing from the master fader in Ardour set up wrong. Sorry about that.
So, apart from not being able to switch between inst/line level on inputs 1 & 2, and needing to find something to replace Jack Mixer with, I'm good to go. Yes, access to internal routing for low latency monitoring would be nice, but that's not urgent for me.
Oh yes, system info post-update: Ubuntu Studio 20.04; kernel version: 5.4.0-29-lowlatency.
Any questions or stuff you'd like me to try, just let me know.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Mon May 11, 2020 1:23 pm
by GuitarNoob
triiif wrote: ↑Fri May 08, 2020 12:36 pm
GuitarNoob wrote: ↑Thu May 07, 2020 11:52 am Geoffrey,
I just acquired a 3rd gen 18i8, if there's any information I can give you that would help your efforts just let me know. Thanks.
in the mean time you could help puleglot with your output to lsusb : :D
viewtopic.php?p=117456#p117456
In this thread you'll find a patch that fix crackling audio that works great for my 4i4, cracklings happen only in a DAW. But puleglot is not confident enough yet, he needs to gather all the scarletts 3gen identificators.
thx
Here is the output of lsusb -vD for the device node: ( VendorId: 1235 ProductId: 8214)

Code: Select all

Device: ID 1235:8214 Focusrite-Novation 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1235 Focusrite-Novation
  idProduct          0x8214 
  bcdDevice            6.45
  iManufacturer           1 Focusrite
  iProduct                3 Scarlett 18i8 USB
  iSerial                 2 F9BKJZJ9600D3B
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0277
    bNumInterfaces          6
    bConfigurationValue     1
    iConfiguration          9 Internal
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              3 Scarlett 18i8 USB
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x00bf
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               41
        bmAttributes            3 Internal programmable clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource            9 Internal
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               42
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           11 S/PDIF
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               43
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           12 ADAT
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype     11 (CLOCK_SELECTOR)
        bClockID               40
        bNrInPins               3
        baCSourceID(0)         41
        baCSourceID(1)         42
        baCSourceID(2)         43
        bmControls           0x03
          Clock Selector Control (read/write)
        iClockSelector          8 Clock Source
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 Output 1
        bmControls         0x0000
        iTerminal               6 Scarlett 18i8 USB 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            20
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               2
        bCSourceID             40
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 Input 1
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                90
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                11
        bSourceID               1
        bmaControls(0)    0x00000000
        bmaControls(1)    0x00000000
        bmaControls(2)    0x00000000
        bmaControls(3)    0x00000000
        bmaControls(4)    0x00000000
        bmaControls(5)    0x00000000
        bmaControls(6)    0x00000000
        bmaControls(7)    0x00000000
        bmaControls(8)    0x00000000
        bmaControls(9)    0x00000000
        bmaControls(10)    0x00000000
        bmaControls(11)    0x00000000
        bmaControls(12)    0x00000000
        bmaControls(13)    0x00000000
        bmaControls(14)    0x00000000
        bmaControls(15)    0x00000000
        bmaControls(16)    0x00000000
        bmaControls(17)    0x00000000
        bmaControls(18)    0x00000000
        bmaControls(19)    0x00000000
        bmaControls(20)    0x00000000
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            22
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID              11
        bCSourceID             40
        bmControls         0x0000
        iTerminal               7 Scarlett 18i8 USB 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 Scarlett 18i8 USB 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 Output 1
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 Output 1
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 Output 1
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 Scarlett 18i8 USB 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 Input 1
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 80 bb 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0230  1x 560 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            16
        bmChannelConfig    0x00000000
        iChannelNames          27 Input 1
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 77 01 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0340  1x 832 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 Scarlett 18i8 USB 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            10
        bmChannelConfig    0x00000000
        iChannelNames          27 Input 1
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 ee 02 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x03e8  1x 1000 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      1 
      bInterfaceProtocol     32 
      iInterface             15 Focusrite Control
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0 
      iInterface              0 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0009
        bInCollection           1
        baInterfaceNr(0)        1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength       0x0041
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                 1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 2
        iJack                  14 Focusrite MIDI In
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                 3
        bNrInputPins            1
        baSourceID( 0)          2
        BaSourcePin( 0)         1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                 4
        bNrInputPins            1
        baSourceID( 0)          1
        BaSourcePin( 0)         1
        iJack                  13 Focusrite MIDI Out
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       1
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       3
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.10
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered
Let me know if there's any more info needed.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Tue May 12, 2020 1:26 am
by alex
Geoffrey,
Like GuitarNoob, I also just got a 3rd gen 18i8. I'd love to chip in and help with anything I can if it would be useful.

OS: Ubuntu Studio 20.04
Kernel: 5.4.0-29-lowlatency

I've had a similar experience: can read inputs 1-4 on the front and 5-8 on the back no problem, and I've been able to get something out of all 6 TRS outputs. Nothing in the way of software controls yet.

No luck taking it out of MSD mode though. Holding down the 48V button for 5 sec (like for the 4i4) did nothing. Per the 18i8 user guide
In order to force your Scarlett 18i8 out of MSD mode without first registering it, hold down the 48Vbutton for Inputs 1 and 2 while disconnecting and reconnecting the USB cable, and then continue to hold the same 48V button for a further five seconds.
Several attempts of this have done nothing.

lsusb -vD output:

Code: Select all

Device: ID 1235:8214 Focusrite-Novation 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1235 Focusrite-Novation
  idProduct          0x8214 
  bcdDevice            6.10
  iManufacturer           1 
  iProduct                3 
  iSerial                 2 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0232
    bNumInterfaces          5
    bConfigurationValue     1
    iConfiguration          9 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              3 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x00bf
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               41
        bmAttributes            3 Internal programmable clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource            9 
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               42
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           11 
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               43
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           12 
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype     11 (CLOCK_SELECTOR)
        bClockID               40
        bNrInPins               3
        baCSourceID(0)         41
        baCSourceID(1)         42
        baCSourceID(2)         43
        bmControls           0x03
          Clock Selector Control (read/write)
        iClockSelector          8 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
        bmControls         0x0000
        iTerminal               6 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            20
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               2
        bCSourceID             40
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                90
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                11
        bSourceID               1
        bmaControls(0)    0x00000000
        bmaControls(1)    0x00000000
        bmaControls(2)    0x00000000
        bmaControls(3)    0x00000000
        bmaControls(4)    0x00000000
        bmaControls(5)    0x00000000
        bmaControls(6)    0x00000000
        bmaControls(7)    0x00000000
        bmaControls(8)    0x00000000
        bmaControls(9)    0x00000000
        bmaControls(10)    0x00000000
        bmaControls(11)    0x00000000
        bmaControls(12)    0x00000000
        bmaControls(13)    0x00000000
        bmaControls(14)    0x00000000
        bmaControls(15)    0x00000000
        bmaControls(16)    0x00000000
        bmaControls(17)    0x00000000
        bmaControls(18)    0x00000000
        bmaControls(19)    0x00000000
        bmaControls(20)    0x00000000
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            22
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID              11
        bCSourceID             40
        bmControls         0x0000
        iTerminal               7 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 80 bb 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0230  1x 560 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            16
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 77 01 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0340  1x 832 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            10
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 ee 02 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x03e8  1x 1000 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      1 
      bInterfaceProtocol     32 
      iInterface             15 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              3 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
GuitarNoob,
It looks nearly identical to your output, except I'm missing the "MIDIStreaming Interface Descriptor" blocks at the end. Were you able to take the 18i8 out of MSD mode?

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Wed May 13, 2020 1:46 am
by GuitarNoob
alex wrote: ↑Tue May 12, 2020 1:26 am Geoffrey,
Like GuitarNoob, I also just got a 3rd gen 18i8. I'd love to chip in and help with anything I can if it would be useful.

OS: Ubuntu Studio 20.04
Kernel: 5.4.0-29-lowlatency

I've had a similar experience: can read inputs 1-4 on the front and 5-8 on the back no problem, and I've been able to get something out of all 6 TRS outputs. Nothing in the way of software controls yet.

No luck taking it out of MSD mode though. Holding down the 48V button for 5 sec (like for the 4i4) did nothing. Per the 18i8 user guide
In order to force your Scarlett 18i8 out of MSD mode without first registering it, hold down the 48Vbutton for Inputs 1 and 2 while disconnecting and reconnecting the USB cable, and then continue to hold the same 48V button for a further five seconds.
Several attempts of this have done nothing.

lsusb -vD output:

Code: Select all

Device: ID 1235:8214 Focusrite-Novation 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x1235 Focusrite-Novation
  idProduct          0x8214 
  bcdDevice            6.10
  iManufacturer           1 
  iProduct                3 
  iSerial                 2 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0232
    bNumInterfaces          5
    bConfigurationValue     1
    iConfiguration          9 
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface              3 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength       0x00bf
        bmControls           0x00
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               41
        bmAttributes            3 Internal programmable clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource            9 
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               42
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           11 
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID               43
        bmAttributes            0 External clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource           12 
      AudioControl Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype     11 (CLOCK_SELECTOR)
        bClockID               40
        bNrInPins               3
        baCSourceID(0)         41
        baCSourceID(1)         42
        baCSourceID(2)         43
        bmControls           0x03
          Clock Selector Control (read/write)
        iClockSelector          8 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
        bmControls         0x0000
        iTerminal               6 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            20
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               2
        bCSourceID             40
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0201 Microphone
        bAssocTerminal          0
        bCSourceID             40
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                90
        bDescriptorType        36
        bDescriptorSubtype      6 (FEATURE_UNIT)
        bUnitID                11
        bSourceID               1
        bmaControls(0)    0x00000000
        bmaControls(1)    0x00000000
        bmaControls(2)    0x00000000
        bmaControls(3)    0x00000000
        bmaControls(4)    0x00000000
        bmaControls(5)    0x00000000
        bmaControls(6)    0x00000000
        bmaControls(7)    0x00000000
        bmaControls(8)    0x00000000
        bmaControls(9)    0x00000000
        bmaControls(10)    0x00000000
        bmaControls(11)    0x00000000
        bmaControls(12)    0x00000000
        bmaControls(13)    0x00000000
        bmaControls(14)    0x00000000
        bmaControls(15)    0x00000000
        bmaControls(16)    0x00000000
        bmaControls(17)    0x00000000
        bmaControls(18)    0x00000000
        bmaControls(19)    0x00000000
        bmaControls(20)    0x00000000
        iFeature                0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID            22
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID              11
        bCSourceID             40
        bmControls         0x0000
        iTerminal               7 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              4 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels             8
        bmChannelConfig    0x00000000
        iChannelNames          19 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0320  1x 800 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            20
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 80 bb 00 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0230  1x 560 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       2
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            16
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 77 01 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x0340  1x 832 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       3
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface              5 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink          22
        bmControls           0x04
          Valid Alternate Setting Control (read-only)
        bFormatType             1
        bmFormats          0x00000001
          PCM
        bNrChannels            10
        bmChannelConfig    0x00000000
        iChannelNames          27 
      AudioStreaming Interface Descriptor:
        bLength                10
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
        junk at descriptor end: 00 ee 02 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes           37
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Implicit feedback Data
        wMaxPacketSize     0x03e8  1x 1000 bytes
        bInterval               1
        AudioStreaming Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         1 Milliseconds
          wLockDelay         0x0200
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass      1 
      bInterfaceProtocol     32 
      iInterface             15 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              3 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
GuitarNoob,
It looks nearly identical to your output, except I'm missing the "MIDIStreaming Interface Descriptor" blocks at the end. Were you able to take the 18i8 out of MSD mode?
I did get it out of MSD mode. I first tried to using the method in the docs but it didn't seem to work so IIRC I just held down the 48v button for about 15 seconds while powering it on.

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Fri May 15, 2020 6:02 pm
by fidel
Just stumbled accross this thread after I bought a Scarlett 8i6 3rd. gen - I am happy to help testing! Is there any chance getting the corresponding patch?

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Sun May 17, 2020 2:00 pm
by olivermusico
Hi!
I have managed to activate the different INST AIR PAD modes ... and route the inputs and outputs ... HOW? with a virtual machine with windows and de focusrite control... after configuring my focusrite I re-activate the card in linux and it works!
It can be a bit tedious if you make a lot of changes, but if not, it works fine.

see you!

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Mon May 18, 2020 12:09 pm
by clovis
Hi olivermusico,

Indeed that worked for me too and that was the first "solution" I came up with, although that's really not convenient. I used a real Windows computer, and as long as you keep the power source active, you can configure the card from Windows and get it the configured the same on Linux system.

So I confirm that works with both 2nd and 3rd Gen Scarlett soundcards... but that's only a workaround! :-)
Thanks.
olivermusico wrote: ↑Sun May 17, 2020 2:00 pm Hi!
I have managed to activate the different INST AIR PAD modes ... and route the inputs and outputs ... HOW? with a virtual machine with windows and de focusrite control... after configuring my focusrite I re-activate the card in linux and it works!
It can be a bit tedious if you make a lot of changes, but if not, it works fine.

see you!

Re: Focusrite Scarlett Gen 3 4i4 (and others)

Posted: Sat May 23, 2020 7:57 pm
by bobby.calamari
GuitarNoob wrote: ↑Wed May 13, 2020 1:46 am I did get it out of MSD mode. I first tried to using the method in the docs but it didn't seem to work so IIRC I just held down the 48v button for about 15 seconds while powering it on.
Just to confirm that this worked for me with my 3rd Gen 18i8.
* Turn it off
* Hold down the left 48V button (not both of them)
* Turn it on again
* Hold the button down for 15 seconds or whatever (could be less)
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