i use an Alesis ion, which can have up to four sounds on call at any time. pretty handy, especially considering you can have a set of four sounds connected with a setup, and have up to (i think) around 70 setups stored on board. one or two setups per song, 8+ sounds reasonably easy to reach.

unfortunetly, its a real "hit or miss" game, as mentioned before. with the ion, there are so many buttons and knobs on any given square inch of the surface that you can't really go wild and just throw a hand where you think the button is.

think accidentilly hitting the FM knob along with that nifty lead you finished the night before.

screeeech.