This is a small switching system designed especially for small pedalboards.
Features 4 loops with Send / Return jacs (true bypass) and 4 presets that can be set up using dip-switches.
The project is free for personal and education use (for commercial use you will have to contact me).
In the zip file you have the EAGLE schematic, along with the HEX file that needs to be burned inside an AT-TINY2313 microcontroler.
Zip archive: QUATTRO SWITCH