Behringer UMC 1820 - New device is ace!

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Pix Retro
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Behringer UMC 1820 - New device is ace!

Post by Pix Retro »

Woop... I love it... took a bit to get it working cause i think my pc is just wierd... lol I had to change it from the umc to something else and back again in the sound settings to get it working the first time and now i can reboot and it works... who knows.... anyway.... stupid question time!!!

I was wondering if there is a way to extend the inputs on the back of the device to a separate panel so I have access to them all at the front... I wasnt planning on a full rack system and was thinking of geting a 2u case and putting a panel blank and setting up inputs 3-8 on the panel so everything is changeable and i don't have to mess about pulling it in and out... not really dealt with rack mount stuff before...

second dumb question... I have a passion for old tech.... I have minidisc and cassette hi fi separates that i run into a mixer... is there a way i can connect them directly to the umc? was thinking of an audio switcher and having one in and one out... is that possible or do i need to get an amp?

I'm sure there will be more to come... :D

Thanks!
GuntherT
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Re: Behringer UMC 1820 - New device is ace!

Post by GuntherT »

Regarding a panel to move the inputs to the front, you could get a patchbay (such as the ART P16), but getting an ADA8200 isn't that much more and is what I did instead. That setup gives you a total of 10 analog inputs on the front along with 6 in the rear. The ART doesn't increase the number of inputs or outputs and will have 10 unused connections in your scenario. Another plus of the ADA8200 is you don't have to buy 6 XLR cables to wire it up, just two optical cables (or one if you don't need the ADA8200's outputs and are ok with it being the master clock). That savings offsets some of the price difference between the units and takes up way less space behind the rack.

Hooking up your minidisc or cassette player to the UMC should only require proper cabling. I don't see why you would need an amp, but you didn't give any information on how sound is currently output from those devices, so I have no specific solutions for you.
Pix Retro
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Re: Behringer UMC 1820 - New device is ace!

Post by Pix Retro »

I'll look into the patch bay/adat route... Seems easiest.. thanks!

The hifi separates are currently running to a RCA switch to a mixer to my monitors... The minidisc is hooked up to record from my pc via optical... Theres no real out put to the pc but was thinking of getting a second RCA switch box for the recording side so I've got one for ins and one for outs and it only takes one pair of inputs..

I just wanted to make sure it wasn't going to destroy my interface.. :D

Thanks again!
GuntherT
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Re: Behringer UMC 1820 - New device is ace!

Post by GuntherT »

You're welcome. Is MIDI working ok? I saw in the last thread someone mentioned MIDI works on the FCA1616, so I assume Behringer used the same spec for the UMC line but am curious how your experience has been.
Pix Retro
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Re: Behringer UMC 1820 - New device is ace!

Post by Pix Retro »

Yeah... Midi is working great... Just need to learn how to use it properly! :lol: Ardour picks everything up nicely... Definitely looking forward to getting to grips with it!
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polk9
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Re: Behringer UMC 1820 - New device is ace!

Post by polk9 »

Hello !

Just a question, does this audio interface works well at 48hz samplerate ??
Piper984
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Re: Behringer UMC 1820 - New device is ace!

Post by Piper984 »

Hello: I have a need to record from specific channels on a UMC 1820, and I'm having trouble getting ALSA to let me select the correct channel.

I'm using Ubuntu 16.04. When I execute

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arecord -D hw:1,0 --dump-hw-params
on the command line I see that there are '18' channels:

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Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
HW Params of device "hw:1,0":
--------------------
ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
FORMAT:  S32_LE
SUBFORMAT:  STD
SAMPLE_BITS: 32
FRAME_BITS: 576
CHANNELS: 18
RATE: [44100 96000]
PERIOD_TIME: [125 165103)
PERIOD_SIZE: [6 7281]
PERIOD_BYTES: [432 524232]
PERIODS: [2 1024]
BUFFER_TIME: [125 330227)
BUFFER_SIZE: [12 14563]
BUFFER_BYTES: [864 1048536]
TICK_TIME: ALL
--------------------
arecord: set_params:1233: Sample format non available
Available formats:
- S32_LE
But when I execute the command line

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arecord -r 44100 -f S32_LE -c 3 -d hw1:0 test.wav
the wav file contains channels 1, 2, and 3 encoded in the file not just channel 3.

Is there a way to just specify channel 3? Do I need to create a virtual pulse device for each UMC 1820 I want to record from?

Thx
dirkk0
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Re: Behringer UMC 1820 - New device is ace!

Post by dirkk0 »

I wouldn't know how to do this with arecord but you can do this with ecasound.

First of all, the command you provided doesn't work for me; this one does:

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arecord -r 44100 -f S32_LE -c 3 -D plughw:4,0 test.wav
Secondly, the ecasound equivalent of this would be:

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ecasound -c -f:32,3,44100 -i alsaplugin,4,0 -o test.wav
I connected a mic to the second channel of the UMC1820, so this creates an empty first and third channel.
To extract the second channel from the file:

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ecasound -a:2 -i test.wav -a:2 -f:32,1,44100 -o test-2.wav -chcopy:2,1
To do this while recording you can use this:

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ecasound -c -a:2 -f:32,2,44100 -i alsaplugin,4,0 -a:2 -f:32,1,44100 -o test-2.wav -chcopy:2,1
This enters ecasounds interactive mode; press 't' to record, 's' to stop and 'q' to quit to make a recording.
martibs
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Re: Behringer UMC 1820 - New device is ace!

Post by martibs »

What round trip latencies are you guys getting out of your UMC1820's? Mine is

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552.100 frames     11.502 ms total roundtrip latency
with 48K sample rate, 64 buffer size, 3 periods/buffer
martibs
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Re: Behringer UMC 1820 - New device is ace!

Post by martibs »

I recently upgraded to a new version of the Liquorix kernel:

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5.17.0-7.1-liquorix-amd64 #1 ZEN SMP PREEMPT liquorix 5.17-11.1~bullseye (2022-05-12)
and I didn't touch my Jack settings at all (except for boosting realtime priority to 50 and client timeout to 5000ms), and this cut my roundtrip time by 40%:

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307.105 frames      6.398 ms total roundtrip latency
It's not running completely without xruns at this setting, so I might have to increase the buffer size for certain workloads.

Edit: Oh yeah, for the record, I disabled spectre/meltdown mitigations. You shouldn't do this at home.
GuntherT
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Re: Behringer UMC 1820 - New device is ace!

Post by GuntherT »

What version of the Liquorix kernel were you using before the update? I am curious if the USB audio improvements that were incorporated into the 5.15 and 5.16 kernels lead to the performance gain you measured.
martibs
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Re: Behringer UMC 1820 - New device is ace!

Post by martibs »

It was 5.12, if I remember correctly, so that is plausible!
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