Whatever I do, GarageBand reads everything from my piano an octave lower, for example c0 on my piano is c-1 on GarageBand. First I tried reseting the transpose on the piano itself via the function button but that didnt change anything in GarageBand. Ive reset my laptop, forgot my device on the MacBook Audio Midi Setup and reconnected it. I have done everything and im honestly stumped because I have found nothing to help me online

Hi everybody! I've been working on a little MIDI language I call "performance". Think of it as algorave software for MIDI instruments. It works with your DAW or your physical synthesizers. Anything that speaks MIDI. The repo in bitbucket contains everything you need to get started.
It's by no means done, but I'd love to hear what you think about it. =)