LinuxMusicians

Does anyone know of a qjackctl tutorial showing patchpay examples of a usb interface with a mic and two instruments?

I have not really found a good one, but I have figured a few things out myself as a newb.

1. Plug in your usb devices
2. Enter the following command in a terminal
cat /proc/asound/cards


0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xdff20000 irq 49
1 [HDMI ]: HDA-Intel - HDA ATI HDMI
HDA ATI HDMI at 0xdfe60000 irq 51
2 [M2496 ]: ICE1712 - M Audio Audiophile 24/96
M Audio Audiophile 24/96 at 0x6040, irq 17
3 [USB ]: USB-Audio - AT2020 USB
audio-technica � AT2020 USB at usb-0000:00:1d.0-1.7, full speed

(My USB Mic is the #3 that reads "USB" in the brackets

3.Use the word before the bracketed portion of the card you want to connect.
In my case: "USB" and alter this command to fit your multiple mics.

alsa_in -d hw:USB -j 'USB Mic 1' -q 4 -c 1 &

* The "USB Mic" portion is a custom name that will show up as a JACK device in Patchbay.
* Since you have two mics, you command might look something like two of the above command back to back, connected by &&

A command like this one is what you would enter in QjackCTL for "Run Command After Jack Starts"
alsa_in -d hw:USB -j 'USB Mic 1' -q 4 -c 1 && alsa_in -d hw:USB2 -j 'USB Mic 2' -q 4 -c 1 &

4. Also make sure to install a2jmidid, and put the following command in QjackCTL in "Run Command at the Same Time Jack Starts"

a2jmidid -e &

--
Your USB audio interface should be listed to select in Qjackctl's Settings--

--

Thank you both wattahay and Stephen_Doonan. I now have a newly installed Kubuntu, KXStudio, and a Behringer UMC404HD interface.

I have my mic into man KLR input of usb interface, and plan to add my synth keyboard and my digital organ/piano to 2 more XLR inputs, run the signals into my laptop, then out from the interface into my mixer to the speakers.

Operating System: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
Kernel Version: 5.4.0-52-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-3320M CPU @ 2.60GHz
Memory: 7.5 GiB of RAM

cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf1630000 irq 34
1 [U192k ]: USB-Audio - UMC404HD 192k
BEHRINGER UMC404HD 192k at usb-0000:00:1d.0-1.5, high speed



07:31:59.176 Statistics reset.
07:31:59.236 ALSA connection change.
07:31:59.242 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
07:31:59.364 ALSA connection graph change.
07:32:39.373 D-BUS: JACK server is starting...
Thu Oct 29 07:32:39 2020: Starting jack server...
Thu Oct 29 07:32:39 2020: JACK server starting in realtime mode with priority 10
Thu Oct 29 07:32:39 2020: self-connect-mode is "Don't restrict self connect requests"
Thu Oct 29 07:32:39 2020: ERROR: Cannot lock down 107341338 byte memory area (Cannot allocate memory)
07:32:39.523 D-BUS: JACK server was started (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
07:32:39.528 ALSA connection graph change.
07:32:39.529 ALSA connection graph change.
Thu Oct 29 07:32:39 2020: Acquired audio card Audio0
Thu Oct 29 07:32:39 2020: creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
Thu Oct 29 07:32:39 2020: configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods
Thu Oct 29 07:32:39 2020: ALSA: final selected sample format for capture: 32bit integer little-endian
Thu Oct 29 07:32:39 2020: ALSA: use 2 periods for capture
Thu Oct 29 07:32:39 2020: ALSA: final selected sample format for playback: 32bit integer little-endian
Thu Oct 29 07:32:39 2020: ALSA: use 2 periods for playback
Thu Oct 29 07:32:39 2020: ERROR: Cannot use real-time scheduling (RR/10) (1: Operation not permitted)
Thu Oct 29 07:32:39 2020: ERROR: AcquireSelfRealTime error
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:capture_1'
Thu Oct 29 07:32:39 2020: New client 'system' with PID 0
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:capture_2'
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:playback_1'
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:playback_2'
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:playback_3'
Thu Oct 29 07:32:39 2020: graph reorder: new port 'system:playback_4'
Thu Oct 29 07:32:39 2020: New client 'claudia' with PID 1533
Thu Oct 29 07:32:39 2020: New client 'claudia-01' with PID 1601
Thu Oct 29 07:32:39 2020: New client 'a2j' with PID 1660
Thu Oct 29 07:32:39 2020: New client 'PulseAudio JACK Sink' with PID 1324
Thu Oct 29 07:32:39 2020: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Triggered
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: ERROR: JackEngine::XRun: client = PulseAudio JACK Sink was not finished, state = Triggered
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: Connecting 'PulseAudio JACK Sink:front-left' to 'system:playback_1'
Thu Oct 29 07:32:39 2020: Connecting 'PulseAudio JACK Sink:front-right' to 'system:playback_2'
Thu Oct 29 07:32:39 2020: New client 'PulseAudio JACK Source' with PID 1324
Thu Oct 29 07:32:39 2020: ERROR: JackEngine::XRun: client = PulseAudio JACK Source was not finished, state = Triggered
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: ERROR: JackEngine::XRun: client = PulseAudio JACK Source was not finished, state = Triggered
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: ERROR: JackAudioDriver::ProcessGraphAsyncMaster: Process error
Thu Oct 29 07:32:39 2020: Connecting 'system:capture_1' to 'PulseAudio JACK Source:front-left'
Thu Oct 29 07:32:39 2020: Connecting 'system:capture_2' to 'PulseAudio JACK Source:front-right'
Thu Oct 29 07:32:40 2020: Saving settings to "/home/dirk/.config/jack/conf.xml" ...
07:32:41.587 JACK connection change.
07:32:41.589 Server configuration saved to "/home/dirk/.jackdrc".
07:32:41.590 Statistics reset.
07:32:41.602 Client activated.
07:32:41.603 Patchbay deactivated.
07:32:41.603 Post-startup script...
07:32:41.604 /home/MY/jack_startup
Cannot lock down 107341338 byte memory area (Cannot allocate memory)
07:32:41.690 JACK connection graph change.
sh: 1: /home/MY/jack_startup: not found
07:32:42.005 Post-startup script terminated with exit status=32512.
Thu Oct 29 07:32:41 2020: New client 'qjackctl' with PID 3402
07:34:27.738 JACK connection graph change.
Thu Oct 29 07:34:27 2020: New client 'REAPER' with PID 3472
07:34:29.065 JACK connection graph change.
07:34:29.160 JACK connection change.
Thu Oct 29 07:34:29 2020: Connecting 'REAPER:out1' to 'system:playback_1'
Thu Oct 29 07:34:29 2020: Connecting 'REAPER:out2' to 'system:playback_2'
Thu Oct 29 07:34:29 2020: Connecting 'system:capture_1' to 'REAPER:in1'