The app separates the normal letter typing map from the controls you actually need to customize.
The regular letters stay fixed. This keeps the learning path, tutor, overlay, and muscle memory reliable.
Chord actions can be mapped to commands, snippets, or workflow shortcuts without changing the base typing layout.
The popup visual keyboard can have a learned key and must follow the engine + gate + tutor rules.
The gate is the safety layer that prevents accidental typing. Gate handling runs before popup or typing behavior.
The intended layout needs the space of a full 88-key MIDI piano. Smaller controllers can be useful for experiments, but the product is designed around a complete piano.
