This is not the exact same circuit (our version has probably 4-5 more capacitors than the other) along with other value changes etc.. while it is based off of, we made many changes. Mainly while it is still great for Bass our version is overall much less dark & muddy in our opinion.
We will take a circuit and pass it around and add or subtract things, change values or whatever suits us till we land on something we feel is best. Pretty much what we have been doing for 10 years now.
If you like “stoner tone” I highly suggest the Sunn-T circuit or experimenting with combos.
Tandem stacking drives, fuzz and boost can yield amazing “stoner tones”.