ok, i had a 3 por, but felt it was just too underpowered. i ended up buying a mesa 400+ but now i am second guessing myself because the 400+ is no 3 pro. sound on the 400+ is good, just may not be what im looking for. with the 4 pro, am i going to get the same sounds as the 3 pro just with more power? i was able to play one at GC and it sounded awesome, i just couodnt do it in a live setting.