I was looking for a 1click solution for changing my audio inputs and outputs on my G4 Powerbook and a friend turned me on to: SoundSource http://rogueamoeba.com/freebies/download/SoundSource.dmg it's free and makes my audio work life less prone to RSI by vastly reducing the number of mouse clicks needed to switch audio routing... version 1.1 is UB so it works on Intel and PPC alike