I normally use GPO on my PC at home with absolutely no problems. I also want to use GPO on my Powerbook G4 (1.3GHz and 1.25ram) but I've had no success whatsoever. I'm basically trying to run about 4 full instances of the players in GPO Studio and also using Sib 4. After about one bar all I'm getting is constant distortion - nothing is audible. Can someone please help as I do expect more with this Mac spec.