<i>I don't actually have a MIDI bass pickup, but I've been tempted.</i><p>Do it. I'm a crap bassist but I run the audio output into a Nord Modular and use pitch analysis to generate MIDI that goes to the drum machine (or whatever), and it's great for coming up with things I wouldn't necessarily do on the keyboard. If you're good at bass you'll get that much more out of it with per-string control.