Foxx Tone Machines - Why No Bias or Starve?

Ginsly

Well-known member
Many circuits have been tweaked by builders to include either starve and/or transistor bias controls- Fuzz Face, Tonebenders I, I.V, II, and III, Bosstone, Fuzzrite… Sometimes for temperature stability, sometimes for texture and gating.

I’m not sure I’ve ever seen a Foxx Tone Machine based pedal with either control… there must be some reason for that..? Maybe the octave-up part of the circuit complicates it?
 
No one's tried a transistor bias on this, huh?

If one WAS to try this, which resistor would they have to turn into a pot?
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