I have recently purchased a Yamaha DB51XG daughter card and hooked it up to my Turtle Beach Pinnacle sound card on a PII 266 machine. I can get the card to produce sound, but when I use the XG editor, I can seem to find the "hidden QS300" sounds. When I load up the midi sounds to it to use, I get nothing out of the card.

Any help would be greatly appreciated.

Sorry, I think tha main difference between the DB51XG and the DB50XG is the former does not have the QS300 sounds. You prolly know that by now. Ditch it and find a real DB50XG!