This issue can probably be resolved by resetting your drum kit.

Try these steps:
1: Go to Options > Midi/Audio driver setup.
2: Change the "Synthesizer/Soundcard" option from General MIDI Instrument Misc to any other option in the list.
3: Press OK and select "Yes" to the message that appears.
4: Then go back into Options > Midi/Audio driver setup.
5: Change the "Synthesizer/Soundcard" option back to General MIDI Instrument Misc.
6: Press OK and click "Yes" to the message that appears which we reinstall the patch.


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