прочитать
То есть, послать в /dev/snd/pcmC0D0 следующим образом: cat <filename> > /dev/snd/pcmC0D0. filename - это любой файл.
The currently designed interfaces are listed below: Information Interface (/proc/asound) Control Interface (/dev/snd/controlCX) Mixer Interface (/dev/snd/mixerCXDX) PCM Interface (/dev/snd/pcmCXDX) Raw MIDI Interface (/dev/snd/midiCXDX) Sequencer Interface (/dev/snd/seq) Timer Interface (/dev/snd/timer)