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I can't recommend using the X-Pan as a proper final mixer. It does what it should, true, but this probably needs more inputs plus some easier methods for panning. Instead, try one of these: https://www.modulargrid.net/e/ph-modular-mixer-black You'd need to connect to the XOH via a 3.5mm TRS to a stereo split 3.5mm pair with this, but that's not too much of a problem. You'd have to lose the Links, but it's probably more sensible in a small build like this as you can accomplish much of what it does with inline mults. Then, after the ph modular goes in, you'll have 2 hp left, and for that I'd suggest a 2hp VCA, which gives you two more linear VCAs specifically for modulation control. With everything else in there, that would probably button this up; I don't see anything else that jumps out at me on this build.