[Jackaudio] Jack shows 22 outputs but only 8 produce a sound output

[Sebastian Roth]

Hello everyone,

I'm new to this list and also new to Linux.
I am a PhD student working on a research project with hearing impaired people.

For
 our research studies we want to realize different audiological tests 
with a virtual acoustic sound system. The program we use for rendering 
the virtual acoustics runs in Linux. 
In our lab, we have a Fireface 
802 sound card from RME. But RME doesn't offer support in Linux and 
unfortunately doesn't provide drivers. 


I 
run the Fireface in ClassCompliant mode and it is connected via USB to 
the computer with Ubuntu Studio 20.04 LTS as operating system. Basically
 the Fireface works, I can use 8 output channels for my sound playback 
via Jack.
But the problem is that I actually want to get playback 
from 12 loudspeakers in our loudspeaker circuit. When I start Jack, it 
displays 22 output channels, but as I said, only 8 playback channels are
 playing sound.

Could this be caused by the snd_usb_audio driver? Or how can I assign the output channels directly?

About any suggestion for a solution I would be very happy!!!


Best regards,

Sebastian Roth
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