How about a 3 chan. head with selectable output tubes [34s,kt88s, 6l6s,or class A el84s Also midi chan. switching in addition to the regular jacks, to make live use a little easier. I know class A/B to class A would be a bit tricky. 1 really good clean ,2 of the same kill chan.s with seperate loops and levels for all 3. Also think that with the amount of gain with tons of bottom people are after these days, maybe some R&D should to slightly larger than 4x12 cabs that would house 15s or even 18s I dont know if anyone makes a suitable 18" driver . recently read a review of a combo that had a sub woofer setup they gave it rave reviews! It would be a stack setup with a 4x12 on top and a 2x18, or 4x18 or 15 on bottom. So much for getting room in the mix for bass guitar, but I think that with all the gainheads in the world, seems there would be a market for it. Also some smaller recording-specific models with similar channels, but maybe 10 watts max output, or similar. The cabs would be a 10 on top and a 15 on bottom. Maybe the top could be driven 10 watts class A , and the bottom 20 or 30 watts class A/B. Its getting hard to not do somthing thats already been done. theres plenty more where that came from , but thats all for now, Thanks for asking!!!!!!