Whoa there Joe! I take some wider meaning from Compaq's response (which I don't believe is necessarily very helpful). GeneJ, in my estimation you will find out very easily what the real problem is if you play one of your MIDI files through Microsoft Media Player and test for A440. If you need help tracking it down please let us know - I have provided a URL in the Mudcat MIDI guide. Pardon me not going into the theory here, I have to dash soon for some skin cancer surgery. Regards, John