decided to make an exact midi copy of the software version of Ik
I really don.t understand what do you mean here
the switch channels (R1, R2, LD) are obviously designed to use the same midi cc. In this situation, it is impossible to have control over channel switching
This is not correct. I use three channel amplifiers live in Amplitube all the time , including the mesa collection. You use let's say cc # 50 with value 0% (0) for channel 1 , 50% (64) for channel 2 and 100% (127) for channel 3
Hope this helps