Hey Nigel, in the early PC days I found software that would turn a pc 'beeper' into an 8bit 11khz or better 'tracker' or .mod file player. This is back when sound cards cost over 100 dollars, when 100 dollars ment 500, and way before I know anything about electronics or how to create a parallel port DAC (they were popular because sound cards were so expensive). I still have the most crystal clear memory of playing back this ragedy little track and it always brings tears to my eyes because I had no idea a computer could make sounds of this quality using only a single internal timer and bit banging the PC buzzer.