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

zcx zcx at mail.co.uk
Thu Sep 30 15:42:00 CEST 2021


Please post the output of

~$ aplay -L

and

~$ aplay -l

zcx

On 29/09/2021 16:23, Sebastian Roth wrote:
> 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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> 


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