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I put this together using Kicad, found it easier to use than Eagle,
you have to cut the 3pdt order switcher daughterboard off the main board,
0805 resistors, fits in a 1590bb

https://www.dropbox.com/sh/5ixdwblsvl59ap9/AACqANHJG9mEsV7grZMmsqnba?dl=0

Arduino Pro Mini reads a 24 position rotary encoder
selects program from 3 eeprom's and prints info to screen
each eeprom holds 8 algorithms
24 programs/algorithms total
I'm using algorithms from pedalpcb (not included here) and the spinsemi forum
download includes Build docs, Arduino code, relay bypass code, eagle files, gerbers
https://www.dropbox.com/s/uhcc6mx8ewgyw0s/FV1%2024.zip?dl=0

Last minute decision to put a Catalinbread RAH infront of the FV-1
Pre-Amp knob is just a DPDT rotary 2 position switch to turn the RAH on or off
I etched the RAH from effectslayouts
Display uses an Arduino nano, both fixed to an etched board
with a 16 position rotary switch to select 16 algorithms from 2 eprom's
Square hole was just drilled and filed, the trick is to open the hole with a file gradually
I.e. keep away from the edge until the last minute!
Paint is champagne metallic from Wilco U.K.
Text is plastisol screen printed
Both baked in an oven at 160c for 15 minutes
I made the FV-1 board in Eagle, it doesn't need the crystal if using the clock circuit and vice versa
FV-1 Eagle files, Arduino code:
https://www.dropbox.com/s/y171s6ltfl4jnyp/Graviton.zip?dl=0

this connects to the fv-1 pins s0,s1,s2,sda,sck
it selects 16 algorithms from 2 eeproms
uses an Arduino nano
I updated the code to show the 3 control knob names for each algorithm:
https://www.dropbox.com/s/wey2foj2xwmgwxs/FV1%2016Position%20Switch%20Oled%20Display%20v2.zip?dl=0

Arachnid pcb from pedalpcb
algorithms from spin semi forum and pedalpcb
housed in a 1590bb