On Tue, Jul 05, 2022 at 03:26:46PM -0400, Richard Cooke wrote: > This has been driving me crazy for a few weeks! I do volunteer work around > Town, and a local church got its hands on a really nice Allen-Heath QU-24 > sound board. It has a USB-B jack. I recently set up a Video camera with > control computer for streaming services and events. The new sound board was > to vastly improve the audio quality. > > When I connect it to the church's "streaming" computer, running Ubuntu 20.04 > it is recognized as both a SOURCE and SINK device. In Audacity, I can select > any of the 32-channels and see they are working. We have our streaming mix > (9) on CH17 and CH18, repeated on CH1 and CH2 for testing. Again, Audacity > has no problem selecting any of them. > > They stream using Zoom, Zoom lists the QU-24 but when selected no audio. We > use OBS Studio 27.2.4 for the video (virtual camera), it also lists the > QU-24 but no audio. > > I figured out half of my solution by creating a virtual sink monitor that > Zoom can use as a microphone: > > # include the default.pa pulseaudio config file > .include /etc/pulse/default.pa > > # null sink > .ifexists module-null-sink.so > load-module module-null-sink sink_name=Source > .endif > > # virtual source > .ifexists module-virtual-source.so > load-module module-virtual-source source_name=VirtualMic > master=Source.monitor > .endif > > > Which I learned from this post: > > https://www.youtube.com/watch?v=Goeucg7A9qE > > https://github.com/NapoleonWils0n/cerberus/blob/master/pulseaudio/virtual-mic.org > > > Which I tested with an analog mic into OBS that came out the Zoom meeting. > > > So, if OBS is not going to pickup the QU audio for me, is there a PACTL > command I can use to path CH1/CH2 to my virtual sink? Or, even better, > CH17/CH18? > > > Thank you in advance! You should (in theory) be able to use module-remap-sink or module-remap-source to create a virtual 2-channel sink/source using specific channels from the 32 channel one. See: https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-remap-sink It may require some experimentation to figure out what names pulse is assigning to each channel, since the first 8 channels are given standardized 7.1-channel names. Take a look here for the string names that module-remap-* is looking for in channel_map: https://github.com/pulseaudio/pulseaudio/blob/7f4d7fcf5f6407913e50604c6195d0d5356195b1/src/pulse/channelmap.c#L39 --Sean
