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On the original Boss CE-1 there is also an op-amp(IC-1) after the transistor high/low switch(Q1 circuit),i believe it also affects clipping.

Isn't there one on this circuit, or am I missing something?
(Two actually, one is a unity gain buffer).

Mr Relish

I would mod your vero so the switch green wire went to the vero, where C1 would be mounted in series, then another wire after C1 went from the vero to the KOC board second C1 pad. Much neater.

Mr Relish

To make the both the Hi / Low true bypass, you could wire the blue wire (input to the hi/Lo switch) and the green wire (hi/Lo switch output to KOC board input) to the C1 pads (blue to the pad closest to the switch, green to the other). You would have to solder C1 in series with the switch output green wire.

Mr Relish

This was just one of those builds that drive you mad.
I built a Fuzzdog Phaze 90. Nice all in one PCB that you solder the footswitch to.
Straight forward build, the only special parts were getting matched FET's.
So, I fire it up, and it works first time.

It works great, EXCEPT for a ticking noise that changes in time with the phase oscillation.

So, I do some research. Seems it's the dreaded LFO ticking.
Recommendations are to replace the LFO op amp (TL072) with a lower power version. I tried both the TL062 and the TL022, but to no avail. More ticking than a watch repair shop. Now, the problem with this particular design, is that both the LFO and the input stage share the same op amp IC, so the ticking caused by the LFO is transferred internally to the input stage. It is recommended to use a separate IC for an LFO that is not used for anything else. But the PCB can't easily be changed. There is no room for a sub board mounted to the IC socket.

So, what did I do ? BODGE IT
I used a TL022 for the LFO section, and a TL072 for the input stage, both with one half in the IC socket.
On the unused OP AMP halves, I tied the inverting input to the output, and the non inverting input to ground.
Wired the grounds and VCC between each IC. Worked like a charm.

Ain't she a thing of beauty ?