critique my circuit?

hi all,

i'm working on my first unique(ish) design -- it's an adaptation of the keeley rotten apple (pedalPCB sour grape), which is itself an adaptation of the EHX op amp big muff (pedalPCB dream fuzz). the input, sallen-key and clipping sections are largely the same, then i've added a tone section based on the neve 1073, a clean blend, and as a bonus i used the clean blend path as an optional buffered bypass. it works and sounds good on the breadboard but can you give it a once-over and let me know if i've made any mistakes or if you have any suggestions for how i could do this better or smarter?

just to preempt questions about this: having the clean level control after the distortion volume is deliberate. from a usage standpoint i would've preferred it to be before the volume but doing it this way prevents me from having to boost the clean signal ~22x and clipping the op amp to get it to a level where it can compete with the distorted signal.

any and all advice is appreciated.

thank you!
 

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based on some very helpful replies and advice i got over at diystompboxes, i've made the following changes:

-VREF filtering cap is increased to 100uF
-GAIN pot lug 3 is tied to the wiper
-VOLUME and CLEAN pots are increased to A100K
-summing amp input and feedback resistors are increased to 1M

1000011223.png sounds great on the breadboard, unless anybody has any other suggestions, the next step is to build the circuit additions on vero, wire it all up and try to fit it all in a box!
 
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