Pavel Fedin wrote:

Is it possible to use two channels of a sound card as two independent devices for PCM playback?

The sound card is probably not able to handle two independent mono streams, but it is possible to use alsa-lib's software plugins to emulate two devices on top of the real one.

Put this into your ~/.asoundrc or into /etc/asound.conf:

pcm_slave.stereo_slave { pcm "hw:0" # or "hw:1" for the second card ... channels 2 }

pcm.left { type plug slave.pcm { type dshare slave stereo_slave } bindings [ 0 ] }

pcm.right { type plug slave.pcm { type dshare slave stereo_slave } bindings [ 1 ] }

Then use device names "left" and "right" instead of "default".

HTH Clemens