things like making lead tracks sound more realistic...'verb or eq settings for simulating a live mic'd cabinet...creative ways of sending the guitar signal simultaneously into two devices ,etc...anyone ever read that article about how SRV got alot of his recorded tones on his last studio album by miking up about 10 different amps, and then mixing them all at the board into a single track, etc? how about using something like an art tube preamp, those little single channel jobs , and run that into the front end of your modeller?