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A browser-based instrument. Play it, practice with it, train your ear on it.

Auxis is built around a real synthesis engine — additive partials with string inharmonicity, hammer transients, and per-harmonic decay — so the keyboard responds like a tuneable instrument rather than a sample triggerer. Seven voices include grand piano, electric piano, guitar, and bass.

The workspace is yours to arrange. Each panel — Listen, Keyboard, Metronome, Scoreboard, Settings — can be dragged, resized, collapsed, or hidden. Choose a layout from the menu, swap the skin, recolor, or build your own room.

Open source. Built and maintained as part of 13STUDIO — a small studio at the intersection of design, code, and music tools.