Bass Pedal running Linux and LV2
https://youtu.be/_lN4jIvcjiI?si=CU8VmJEUhd_LLV67
Not fully open source but uses a lot of open source tech and includes some open source plugins.
I used analog everything for my guitars but recently switched to a lightweight cheap solid state bass amp and fit bass specifically if probably consider having fun with this. For first I still think pushing tubes hasn't been replaced.