PedalPCB Gnat mod - "The Dizzy Elk"

[Coda]

@music6000 @peccary
Bringing this thread back up instead of starting a new one.
Been debugging this mod for a bit. wondering why timbre/attack knob acts as a volume knob. I swear I saw others post about the same.
C4 and C5 are reversed on the DE PCB Val and schematic. I haven't corrected on my pcb yet but wanted to point out so proper docs could be posted if so wished.
edit, disregard below
Also, Is 18k the correct value for R9?

Makes way more sense for the filter cutoff freqs.
Thanks!

Cause it’s almost like a volume control. The OG’s only had 3 knobs; no volume…

 

[jwin615]

Cause it’s almost like a volume control. The OG’s only had 3 knobs; no volume…

Should be a high pass sweep.
Fixing C1s value helped. Lifting R9 helped more.
I think some of the issue is this is one is my attempt to run Si Qs in it. (2n2221a in Q1and2, 2n2222a in Q3) Bought several boards to fudge around with.
But C5 and R9 create a HPF at 1.5k leaving little signal behind at the end of the taper.
I think I'm going to tweak those values some more. Maybe something like 18n and 220n would be better suited...
That would sweep to 880hz
Or just increase the value of R9 some to lower the cutoff(and decrease volume loss)
If one desired, you could replace R9 with a 100k trim pot and tune the hpf cutoff extreme to taste.

Also, fwiw, this guy sounds pretty gnarly without any clipping diode present. So if anyone decides to put a diode switch on here, definitely try a no diode position.