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Try a four quadrant multiplier (an LM13700 can be set up as a dirty one).

No, that one's a Buffalo FX circuit so neither I nor Verlie did those, I think it was a small French company and the owner got sick? I think there's a TGP thread about the whole saga, any way, she ended up taking over the designs. A large majority of the stuff I've done hasn't even been...

I do 'em like this, that about the same as your method? But uhh... that Stonedeaf schematic is... well it's certainly an interesting approach. Edit: Just realised this read like I was complaining about Rob's CD4007 drawing, was referring to Stone Deaf's approach to the MPF-1!

The problem you're finding there, is there isn't a FET in that circuit.

Don't need a scope, you can just build an audio probe. If you post full voltages may be possible to spot the fault.

Oh how ironic would it be to find out you'd bought a hastily released heavily gooped clone. That must be it :unsure: lifting all those spools of 63/37 will do that to a man, entire kilo's of pure, somewhat adulterated lead. 🤣 Do you reckon you'd been caught out before and not cottoned on?

Wait, they're not shipping yet, then how did you get hold of one? Have you reached the level where you just non-nonchalantly wander in to builders homes at this point, take a pedal, shrug and go "It was always going to end this way..." 😜. Verlie, she's one of the good ones, honestly she was...

Did you use a known name when you ordered it? Because if so, this builder has gone up in my estimations just for the sheer "Robert? Well fuck that guy if he thinks he's tracing this I'm going to make him work for it!"ness of it all 🤣

Did we really believe this was going to end any other way...

100-200pF to ground after the 10k resistor should cover RF without impacting frequency response.

Have you tried a small cap from the input to ground?

Yes it does matter and no it doesn't matter. Is there a perfect Tone Bender in existence? Yes, but only to that individual user... without going back in time and measuring originals, we'll never know what the ideal gain and leakage was or if there ever was one. You have to experiment and...

Pedal builders hate this one trick where Robert traces their pedal and it's just a tweaked existing circuit.

Oh I just meant you can lop off the DMM style LFO section and stick it on your chosen PT2399 delay if you're handy with a bit of perf or vero :)

You're welcome to this schematic if it's of any use.

Can we see your splitter blend schematic? There's really only two ways of doing it... either a single pot blends between wet & dry or there's two separate pots for wet & dry, both ultimately produce the same outcome only the latter never goes full dry in which case, you may as well use the...

The tone control is post distortion, you have to tap off the input with a buffer of some description in to the 'Dry' input. It's just a simple place to add it, you could also re-jigger the output op-amp... wherever you put it, you need a buffer from the input and some mixing resistors.

Easy, just switch the now floating 10k mixing resistor to be in parallel with the original filter resistor which you've changed to 10k which gives you 5k/4n7 which is exactly the same cut-off as 4k7/5nF. Might not be the best place to mix dry in, but it's a relatively simple solution.

If you don't mind your clean getting tone controlled and you're not too precious about the circuit you could always turn one of them fancy 4k7/5n filters in to 2 x 10k to get your mix tap and use a 4n7 cap.