Is this possible?
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I think the whole idea of master is for it to be after everything else.
If you want to apply a modular setup to many instruments, you could use multiple machine inputs and figure out a creative way to route them through. It isn't exactly what you were asking for but might be worth exploring.
What about exporting your track, loading it in the PCMSynth and send it to the modular via the machine input ?
That's it man, thanks dudes