[pulseaudio-discuss] [PATCH] Added support for Creative SoundBlaster Omni Surround 5.1 USB sound card. Mic and Line in inputs were not working at all.

[Raymond Yau]

>
>> Do surround51 works since you have a hardware volume knob but PCM
playback volume is mono
>
> If I understood you correctly - I've took mono sound (wav from ALSA
package) and played it through VLC, all channels work as expected.

Card hw:2 'S51'/'Creative Technology Ltd SB Omni Surround 5.1 at
usb-0000:00:14.0-6.2, full spee'
  Mixer name : 'USB Mixer'
  Components : 'USB041e:322c'
  Controls      : 12
  Simple ctrls  : 5
Simple mixer control 'PCM',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 128
  Mono: Playback 91 [71%] [-18.50dB] [on]

Seem no individual channel volume control

Do this mean the balance slider in sound preference is useless ?

Usually those multichannel usb audio devices have this type of volume
control which is not supported by pulseaudio

Simple mixer control 'Speaker',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right - Rear Left - Rear Right -
Front Center - Woofer - Side Left - Side Right
  Limits: Playback 0 - 197
  Mono:
  Front Left: Playback 196 [99%] [0.00dB] [on]
  Front Right: Playback 196 [99%] [0.00dB] [on]
  Rear Left: Playback 196 [99%] [0.00dB] [on]
  Rear Right: Playback 196 [99%] [0.00dB] [on]
  Front Center: Playback 196 [99%] [0.00dB] [on]
  Woofer: Playback 196 [99%] [0.00dB] [on]
  Side Left: Playback 196 [99%] [0.00dB] [on]
  Side Right: Playback 196 [99%] [0.00dB] [on]

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa?id=527078523815587bfd021bc1d10782403e9b3e84
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