What if you inverted the entire piano keyboard?
- Flipping an entire folder of midi recordings
- Flipping a midi keyboard in real time
- Mido (Python package for MIDI manipulation)
- Qsynth (MIDI playback GUI)
- Soundfonts https://www.polyphone-soundfonts.com/en/soundfonts/keyboards/pianos/page-2
- MIDI Recordings from http://www.piano-midi.de/rach.htm