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What’s a good clean blend circuit that plays well with a fuzz?

This one:

No, because the input of the fuzz will see the buffered, low impedance signal. It won't work with a fuzz face, which needs to load down the guitar circuit to produce it's characteristic tone.

Assuming the fuzz is a FF type, I can see one of two solutions: 1) incorporate an inductor based pickup simulator circuit a la AMZ in the blender just before the FX send, or 2) wire a jack in parallel with the input for use as a non-buffered "send". Done.