modular-synths
There are 2 repositories under modular-synths topic.
joeSeggiola/jamman-arduino-sync
An Arduino project for syncing the JamMan Solo XT looper pedal (and compatible ones) to any analog clock/pulse input, for example from Korg Volca units, Arturia sequencers and synthesizers, Eurorack signals, etc.
ijnekenamay/Passive_modules
This is a passive outboard device for modular synths and can be used a "bare"PCB.