If you open the CLASSIC TRACKS window you'll see boxes for BANK and LSB as well as the PRG (program number) box. These extra boxes are used to access additional banks in keyboards such as Yamaha which have more than just the GM sounds.

Exactly how these are implemented changes between manufacturers and sometimes even between different models. Your keyboard manual should have some information on this, or you can just experiment.

If your downloaded file has a program change embedded, you may need to delete it using the EVENT window for the new information to work.

Hope this helps.

ROG.