Reference: sndSplitChannels
sndSplitChannels(snd, s1, ..., sN). snd is a sound, and s1, ..., sN are strings with the names of valid identifiers. The sounds s1, ..., sN will be created with the channels 1, ..., N of snd. Example: sndSplitChannels(song, "l", "r") creates the sounds l and r with the left and right channel of the stereo sound song, respectively.