We're not sure if you'll want to actually play PSP with the sound off, though, as we found the music to be one of the best parts of the experience. We pushed the volume to max, and managed to get the system pumping out bass-filled tunes and sound effects -- typical quality Sony sound, for anyone who's experienced sound through a Sony MD player before. Having played cartridge-based portable games for over a decade, the jump to UMD-based games is like jumping from cartridges to CDs as far as sound is concerned. Metal Gear in particular has a soundtrack you'll want to listen to, with Minna no Golf retaining the humorous voices and sound effects you expect from the series.