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even if your last proposition doesn't work for virtual channel "all", it helped me a lot, and I tried something which works perfectly on my computer, with the same USB sound card. Here is the config file : pcm.dmix8 { type dmix ipc_key 1001 slave { pcm "hw:2" rate 44100 channels 8 period_size 1024 ...


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I'm not sure if you can use different dmix definitions with the same ipc_key; it might be a better idea to use a common dmix device. To be able to play a stero file to all channels, you have to convert it to mono first. pcm.dmix8 { type dmix slave { pcm "hw:1" rate 44100 channels 8 period_size 1024 ...


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I think the issue is that front:, from the other question, would not have worked since front: refers to a set of speakers, rather than a microphone or recording device. You could use the hw:CARD=X,Y format, but you'll get a little bit more flexibility if you use, as @CL suggests, the plughw:CARD=X,Y. Plughw can automatically take care of resampling or value ...


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Here's one way to do it from ~/.asoundrc ; example shows an on-board and soundblaster live card united under the default PCM. # duplicate audio to both devices pcm.!default plug:both ctl.!default { type hw card SB } pcm.both { type route; slave.pcm { type multi; slaves.a.pcm "sblive"; slaves.b.pcm "onboard"; slaves.a....


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Based on correspondence with the poster (see comments), it turned out that the sound card was muted inside pavucontrol.


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You want to use the multi-plugin. Several well documented examples of its use exist: From the alsa people: http://alsa.opensrc.org/TwoCardsAsOne From somebody with a similar question here: http://unix.stackexchange.com/a/194631/127903


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Since introduction of Dmix in alsa, pulseaudio turned to be useless. Bare alsa with Dmix somehow enabled deep inside (I haven't have to set anything) works much better for me. For example, there is no delays while a sound level is being changed. Just uninstall pulseaudio if you are using recent alsa and feel fine.


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I asked this same question here: http://raspberrypi.stackexchange.com/questions/50596/how-to-change-audio-levels-of-sound-card-with-same-control-names and got the answer from CL. Use amixer -c2 controls to list all the low-level controls. Then you can use amixer -c2 cset .. to select specific controls by their unique ID number. Running the ...



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