I think the Marshall JMP-1 would be a solution, it provides a vast number of patches but more importantly has 4 distinct channels. However, I already use a Marshall amp and 4x12 and what I am not sure is can I put the JMP-1 into this or do I need to go and buy a stereo power amp as well? Anybody used a JMP-1 with a normal amp? Mine is an AVT50 head so it's single channel.
C.