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Question: is there a (relatively) simple way to reverse the envelope response and/or invert the LFO CV in single supply designs?

I think it would be cool to have a stereo effect(s) where the inverse response is happening in L and R channels, synced from the same LFO/Env.

Hello again! Really dug this extra filtered pt2399 circuit. Built mine with a fx loop and master volume.

Just a curiosity about the D2 LED across pins 7 and 3. the build doc says its there to reduce distortion at the input... but Pin 7 is not the input and pin 3 is ground.

So whats really going on here?

And can this be used to some benefit/effect in any other PT2399 circuit?

Well this is my first post here, might as well show my ass. Have built hundreds of pedals, worked proffessionally in music electronics for 7 years... About ready to throw this pcb in the trash.

The circuit works and passes signal, only problem is there is a constant squeeeeel at about 3khz... Like the input and output are connected forming a feedback loop... Only there is no such physical connection. Have tried pcb without bypass switching and the problem is definitely on the pcb. I noticed the output trace runs directly underneath the input components... Wtf!? High gain circuit pcb layout fail! When signals are in phase with each other you don't run traces like that!!! Curious if anyone else has built one of these thin sale pigbutt boards with success.

Subbed some resistor values for what I had on hand, stayed "close enough" imo. Kept the fixed gain resistors in op amp stages to have gain equal to or less than stock.

Voltages are all good and closely match spec'd values on the instructions.