Drumline

Hey!
First of all- I think muse score is the best thing since sliced bread. I'm working on a piece for my marching band, so I downloaded the new drumline soundfont. Unfortunetly I cant hear anything from the S.D., T.D., or B.D. in the playback. Ive downloaded and selected the "Template" and "Sound" files, and I can enter in notes just fine. I then tried turning up the drums' volume using the mixer, but again, no noise. Any help would be awesome! Thanks!