[pulseaudio-discuss] [PATCH] alsa-mixer: sb-omni-surround-5.1.conf: remove analog-surround-21, add Linux 4.3+ support

[Raymond Yau]

>
> I've been looking at those lines. Do you think it should be done in
USB-Audio, or should it be added into separate config file specific for
this sound card?

http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/pcm/surround21.conf;hb=HEAD

The route of surround21 is hardcoded to use surround51 , this mean your
ttable are used by those usb audio support 6 channels, those usb audio
which only support 8 channels need to define their own 21 route as both
surround51 and surround71 of usb audio use route plugin
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