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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.

It just lessens the response of the 220n/10k hi-pass a bit, so you get more bass passing through. Good for bass players? Some seem to prefer less bass on the wet side; solved by reducing C3's value.

Right, so, quickly tossed this together, I've shifted the mixing trim to the BBD input to account for the new chips lack of headroom and the insertion loss difference between the two chips. It's not an ideal solution as it messes with the bass response a bit... but I couldn't think of a better...

Oh and no need to bother with the original zener based regulator, it'll give a hair under 6V out, just lift the ground pin on a 78L05 with a pair of 1N5817 or 1N4148 if you want a tiny bit more sweep, should be close enough. Just use an LM1458 for the LFO rather than bothering with individual...

No, LDR's aren't linear in response but I'd be more concerned with finding one with a good resistance range to get a decent sweep ratio over that sort of nuance... LDR's age, an original unit isn't going to give the same response it did when new either.

Depending on the clock frequencies required, an MN3007 might be fine? The SSI isn't a bad chip as such, it's just not the circuit I'd pick to drop it in, in an ideal world we'd have access to MN3004 but beggars can't be choosers in this day and age; kind of an irritating circuit in general to...

When we say clock it's a bit of a generalisation as there's several components to it... a modulation element, an oscillator and usually, a flip flop to provide both phases i.e. the tick and tock of a clock. The square wave 'clock' directly connecting to the BBD isn't what changes the sound...

Yes the schematic is wrong, what's all the +1, +2 business about though? So (excuse the quick shoddy drawing) you want the attached. Don't worry about testing it at +9V or +5V, looking at the SSI datasheet this morning, it doesn't have an internal divider akin to the Reticon chips as I...

I'll tell you what, I'll reimagine the audio path for you to suit the new chip, you don't need the 4049 any more and may as well just use a different oscillator (anything that runs on 5V happily should be fine) and then the LFO is, well it's just an LFO driving an LED. If you build just the...

You'll also have to contend with how the mixing is done here... the TDA1022 has a lot of signal loss, so the mixing resistor (albeit partially determined by trimming) is of smaller value than the dry to compensate. Unfortunately for you, said mixing is part of the output low pass filter and by...