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What are your bias voltages, the transistor buffer is relying on the J-FET in this situation for optimal bias. Poor bias, poor signal swing and unfortunately, the J-FET's biasing is also impacting its gain.

Well have you tried just putting the source and emitter resistors and J-FET's biasing 1M to -12V? But more to the point, have you checked what kind of voltages you're currently getting on the J-FET and transistor?

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.