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This is a passive capacitors bank used for low pass and high pass sound sculpting on an old modular moog module. You can replace the 10k resistors with a 25-100k pot for a more dramatic filtering, and add true bypass switches.
I tried this with a guitar, hot-plugging various caps on a pot soldered with a transistor slot for easy swapping. I think there is more tonal difference between different caps (ceramic and mylar for example) of the same value than between same type caps of the next closer value.
Idea ! Add a small transformer in the path to add inductance, for band pass/reject filters
