Using either the basic or full drum set, the snare drum plays midi note D1 when selected but midi note G0 during playback. Not sure why this is happening. For Halion it sounds correct as both notes play back a snare, but other GM libraries (at least one of the ones I have) don’t have any sound mapped to G0. Nevertheless, it seems like a bug to play one note on selection and another on playback.
I don’t know if this happens for other notes in the drum set, I just noticed it for the snare. A few of the others that I looked at seemed to be consistent between selection and playback.