I’m using insert 1 to go into my Iridium that sends back to input 3. Insert 2 sends to my amp, and the stereo outs (1+2) go into my interface. This way I can play through my amp with the H90, and when I want to record or play through my monitors I don’t need to touch any cables. Works great and I can also put the Iridium pre/post effects depending on the program. The mix on insert 2 (to amp) must be 0%. Thanks to @joecozzi for his guidance.