[linux-audio-user] Outputting same sound source to multiple cards simultaneously

Hoping somebody can give me some hints here... 1) I would like to configure amarok to play output to multiple soundcards simultaneously. One soundcard is connected to speakers next to my computer; the other is connected to wireless speakers over USB ( i.e. is a usb audio device). I can get either/or to work, but haven't figured out how to get them both to work simultaneously. 2) (not so important) I would like to further extend this so that mplayer can output to the desktop soundcard at the same time that amarok continues to play music to the USB audio device. Does anybody have advice and/or references to boilerplate config that'll accomplish these? Thanks, Reuben