<p style=”text-align: left;”>Right now, I’m using the 4CM with one of my amps that has an effects loop. I want the various fuzz and drives to be in front of the amp, while modulation goes to the loop.  I’m thinking about ditching the IR-D because it’s not quite hitting the mark.</p>
Either way, if I’m using the 4CM, I’ve got inputs/outputs 1 going to the front of the amp, and using inputs/outputs 3 for the loop. And have the H90 set up for dual routing.

Am I able to use any of the inputs/outputs to access Preset B for a guitar > H90 > A3 setup? Or am I restricted to the set up you had posted above? I guess I really only have inputs 2 and 4 available.