This is a basically stock Pedal PCB Minnow, I reduced R13 from 100k to 91k which reduces the minimum resonance a little. I found this to be useful in the sample/hold mode.
(https://live.staticflickr.com/65535/51325483687_7521f1196f_c.jpg) (https://flic.kr/p/2mcsw9x)
This circuit was quite noisy at first, but only in bypass. I shielded the input and output cables and this helped a little. Eventually, I traced the noise to IC2, the LFO opamp. It was screaming like Satan's own 56k modem and the output jack was picking it up. I replaced the TL072 with a JRC 2068D. The scream became a loud hiss. I covered the opamp and socket with masking tape, then shielded that with HVAC tape, which is grounded to the enclosure. That got rid of the noise.
(https://live.staticflickr.com/65535/51326941819_8564826982_c.jpg) (https://flic.kr/p/2mczZAK)
This is a fun circuit, but definitely plan on having to debug it to get it sounding right.
Very nice. Brian had one a few years back, I really dig it. I like the 125b foot print too.
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Awesome graphic! That looks killer