USB Audio Recording Yamaha MG12XU

[Hans Petter Selasky]

On 2020-04-19 23:47, Terin Stock wrote:
>    $ systctl dev.pcm.4
> dev.pcm.4.feedback_rate: 0
> dev.pcm.4.bitperfect: 0
> dev.pcm.4.buffersize: 0
> dev.pcm.4.rec.vchanformat: s16le:2.0
> dev.pcm.4.rec.vchanrate: 48000
> dev.pcm.4.rec.vchanmode: fixed
> dev.pcm.4.rec.vchans: 1
> dev.pcm.4.play.vchanformat: s16le:2.0
> dev.pcm.4.play.vchanrate: 48000
> dev.pcm.4.play.vchanmode: fixed
> dev.pcm.4.play.vchans: 1
> dev.pcm.4.hwvol_mixer: vol
> dev.pcm.4.hwvol_step: 5
> dev.pcm.4.%parent: uaudio1
> dev.pcm.4.%pnpinfo:
> dev.pcm.4.%location:
> dev.pcm.4.%driver: pcm
> dev.pcm.4.%desc: USB audio

Likely your device does not provide a hardware mixer control for 
recording, so that's why mixer doesn't have any "rec" device. Only for 
playback we provide a software volume control in that case!

--HPS