Let me quote the Eclipse manual, for instance Reverse Crystals preset: “If you want to modulate the input to the loop […], this is a fantastic place to do it. You won’t get zippering.”

Well, I agree with that. How can I realize this fantastic input modulation with just an H9 and an expression pedal? Looks impossible to me. My current solution: Boss LS-2 + Boss FV-500L. It’s also fantastic, but takes a lot of space…