On 10/10/16 19:31, Goran Mekić wrote:

I own 2 18ch audio interfaces, and both have the same symptoms described in 
Since I wrote that mail, I did a little research. My hypotesis is that audio is 
9 times faster as driver is handling 18 channels like they are 2. Also, if 
something for stereo stream is sent to all outputs, you expect to get some 
small and very high pitched output on all out jack, and I do. Also, playing 
with http://manuals.opensound.com/developer/singen.c.html revealed to me that 
if SNDCTL_DSP_CHANNELS is set to number different than the number of actual 
channels in a working stack (laptop and it's internal audio interface, in my 
case), you get difference in pitch and volume.

I didn't poke snd_uaudio code, yet, as I didn't do any kernel development 
before, but I'm affraid the number of kernel developers with multichannel audio 
interfaces is quite low, so I don't mind getting my hands dirty, but I'd love 
to get some advice before I attack this problem. Thank you!



Up to 127 channels are supported using USB audio.

Which version of FreeBSD are you using?

What does dmesg say about your audio device.

Channel numbers above 8, are only supported through bitperfect modes. Then you'll need something like virtual_oss, to subdivide the audio device into several 2-channel or 1-channel DSP devices.

svn --username anonsvn --password anonsvn \
      checkout svn://svn.turbocat.net/i4b/trunk/virtual_oss

cd virtual_oss
make all install
man virtual_oss

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