Please let us know how you go at rehearsal, Paul, and good luck mate!
Well, first KPA rehearsal complete and overall I think it went well. Sound wise things were good, I stuck mostly to some free Mesa MK3 profiles I found on the Rig Exchange which just sounded the most like my Mesa. The only negative thing really was that somehow while there was plenty of volume using the powerhead in to a Marshall 1960 cab the sound didn't seem to punch through quite as much as my normal amp. I'm sure it's just going to require some tweakage.
Another issue that I had was with feedback, My master volume was around 65 - 70% and with a mid distortion drive rig my guitar was howling whenever I let it go. I don't normally have feedback issues like that with my normal amp even at much higher volume levels so I need to experiment and see what was happening there.
All in all though, very pleased... looking forward to the next one!
Oh, and one other impressive feature... one trip from the car!
[Blocked Image: http://www.pauljoy.com/images/kpa_carry.jpg]