Mods on existing harmonic percolator schematic

[Tbdcco]

Hi.am planning to build my own harm.perco project.
This is a circuit from fuzzdog.
Is there any mods/suggestions that can be made to this existing schematic?

[rutabaga bob]

Welcome!  Do a search for 'harmonic juergulator'.

[Rob Strand]

Pots for R1 and R2 might help you dial-in the tone you want.

[Gus]

Do a search for "harmonic percolator" at this forum. There have been threads here with good information on this circuit.

[Tbdcco]

Thanks!