what is this?

it's just a little thing i made to try out the FV-1 chip. meaning, it's entirely basic, just the FV-1 (as per datasheet), mono, with some op-amp buffers around it (inverting, 0.33x gain with manual offsets for the CV inputs. as well as buffers/amps for audio i/o). the funny 8x switch is replaced by an attiny + tact switch. there's also a vactrol-based wet/dry mixer with CV blend à la "X-fade" from the MusicThing spring reverb (see page 2 here). and there's a jumper on the back to switch between the (not-so-great) factory programs and whatever is stored externally, on the eeprom.

minimal build guide:

see here: https://github.com/mxmxmx/spinFV1/wiki/minimal-build-guide