Only thing I could find is a Eurorack module:
https://blog.bela.io/salt-a-bela-powered-programmable-synth-...I thought there was some repo public with C++ code, but I can't find it anymore... (https://github.com/belaPlatform)
EDIT: stupid me, it's linked in the article: https://github.com/giuliomoro/pink-trombone