speaker configuration of USB audio device
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I am attempting to use a StarTech 7.1 USB external sound card to get 7.1 surround in Trisquel. It should work with Belenos as it is internally identical to this:
https://h-node.org/soundcards/view/en/1724/Aureon-7-1-USB
VLC recognizes the device, but plays in stereo instead of 7.1. I had the same issue in Windows until I configured the device in system sound settings to default to 7.1, so I suspect I need to so something similar in Trisquel.
However, while both the microphone and line-in on the device show up under System Settings->Sound->Input, the device does not appear under Output, so I'm not sure where to access the device's default speaker configuration. Thanks in advance for any advice.
PulseAudio solution (should work for other CM6206 devices as well):
to configure device
- install PulseAudio Volume Control from repository
- open PulseAudio Volume Control
- find device under Configuration (for me it is labeled “CM106 Like Sound Device”)
- change profile to “Analog Surround 7.1 Output + Digital Stereo (IEC958) Input”
- select device under Output Devices (green checkmark)
if using with VLC
- go to Preferences->All->Audio->Output Modules->ALSA
- set “Audio output device” to “Playback/recording through the PulseAudio sound server”
- set “Audio output channels” to “Surround 7.1”
if unhappy with channel mapping
- gksu gedit /usr/share/pulseaudio/alsa-mixer/profile-sets/extra-hdmi.conf
- go to “[Mapping analog-surround-71]” block
- change “channel-map =” line to desired mapping
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