Thanks for that information, but I'm not so sure I want to follow all of it. I already have Cakewalk TTS-1 set as my "synth/soundcard." It works fine like this, and I prefer the sounds I get from TTS-1 anyway. So, why would I want to change back from it to General MIDI Misc?

As I mentioned in my opening message, this problem appeared out of the blue this morning. And it also happens with RT Drums, not just MIDI.