Notanorgan
https://notabug.org/namark/sketchbook/src/3b215b9e7ddc66bfc579f7de01b39abe659a49b5/notanorgan.cpp
https://git.sr.ht/~namark/sketchbook/src/3b215b9e7ddc66bfc579f7de01b39abe659a49b5/notanorgan.cpp
https://gitlab.com/namark/sketchbook/blob/3b215b9e7ddc66bfc579f7de01b39abe659a49b5/notanorgan.cpp
https://github.com/namark/sketchbook/blob/3b215b9e7ddc66bfc579f7de01b39abe659a49b5/notanorgan.cpp