Sounds like you just need to reset your drum kit.

To do this, go into Opt | Midi/Audio driver setup.
Change the "Synthesizer/Soundcard" option from General MIDI Instrument Misc to any other option in the list.
Press OK and say "yes" to the message that appears.

Then go back into Opt | Midi/Audio driver setup.
Change the "Synthesizer/Soundcard" option back to General MIDI Instrument Misc.
Press OK and say "yes" to the message that appears.

That should do it but if not let us know!


Cheers,
Deryk