Alchemusica is a free, open-source MIDI sequence/editor for macOS. It has the following features:
- Piano-roll editing
- Numeric editing
- Audio input/output
- Scripting with embedded Ruby interpreter
Alchemusica runs on macOS 10.6 or later. At present, only Intel binary is provided. Support for Apple Silicon will follow.
https://d-alchemy.xyz/software/alchemusica/
Toshi Nagata (Personal Website: Digitalians' Alchemy)
Alchemusica is distributed under GPL v2.