@mniip: It's funny I was just thinking about that the other day. The only downside to that compared to generating sound from the PC speaker is complexity. For a musician it's no big deal, but just generating sound from the PC lowers the entry level and opens the door to the more general user. TPT will never be, say, MAX/MSP, so maybe keeping it simple would be better? I like the MIDI (or OSC these days) idea, but I wonder if it's appropriate because it definitely puts a limit on who can enjoy it.
Edit: @awesomeone101: I do, lol, and a rack full of synthesizers right next to it. But yeah I agree (we posted at the same time).