very easy to do, as long as the audio gets mixed before it
enters the computer, or if you happen to have a multi channel sound
card. The multi channed sound cards are very expensive. i recommend
getting a USB capable mixer (Alesis makes one for about $180)),
then mixing your inputs at the mixer, then feeding that signal to
your USB, where it will be interpreted as a regualr input signal
(jsut like a mike).