I recently got a JCM 2000 DSL 100, and before that I was using a Carvin X100B, both of which are 2-channel amps. Therefore, I can use the simple Amp Control jack on the GT-100 to set the channel for each patch (had to solder a custom cable jack for the Carvin). Since the JVM410H (and C) is a 4-channel amp, I doubt that'll fly. But there's MIDI.... So my question is, can the MIDI ports on the GT-100 switch between four channels? I'm not asking to switch between the MODES of each channel, because I would typically pick my "favorite" mode and leave it there, but can it handle 4-channel switching? And if so, where would I find the instructions?