I've read this a couple of times over the years but it still does not make much sense (to me)... http://alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html As a baseline, say I started with this, where could I go from here to get an app (ie; Amarok) to play back out two soundcards at once ? # cat .asoundrc pcm.NVidia { type hw; card NVidia; } ctl.NVidia { type hw; card NVidia; } pcm.USX2Y { type hw; card USX2Y; } ctl.USX2Y { type hw; card USX2Y; } pcm.shared { type dshare ipc_key 321456 # any unique value ipc_key_add_uid true slave NVidia slave USX2Y bindings { 0 0 1 1 } } --markc _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user