One to three octaves of playable keys, and a four-slot loop station under them that records exactly one lap and never lands off the beat. Every note is placed at its own angle around your head — low notes to your left, high notes to your right and a little above — so a chord fans across an arc instead of stacking up in the middle. Headphones, and it is a room.
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Every voice has its own HRTF panner and is placed by pitch the moment it is struck, so left-to-right on the keys is left-to-right around your head. Play a spread voicing and you can pick out the inner parts, because they are no longer fighting for the same square inch of skull.
Pick any key and any of nine scales and the notes in it are marked with a dot, the tonic with a ring. Nothing is disabled — a keyboard has twelve semitones and always will, and greying out the accidentals would be a lie about what you are looking at. It is a map, not a set of stabilisers.
Arming a slot does not start recording — the clock does, at the top of the next lap, and it stops exactly one lap later. The capture window is sample-accurate inside an AudioWorklet, so layers tile without an off-by-one and overdubs sum in place instead of drifting.
Multi-touch throughout: a chord is four fingers, and sliding across the keys glissandos rather than sticking on the one you started on. On a computer the classic tracker mapping applies — zsxdcvgbhnjm for the lower octave,q2w3er5t6y7u for the one above.
The microphone joins the loop bus with its round-trip latency compensated, so a vocal or an acoustic take lands on the beat rather than a few milliseconds behind it. It feeds the looper without feeding the speakers, which is the difference between a layer and a howl.
Bounce the layers to a seamless one-lap WAV and hand it straight to a deck or to the 8D renderer, where the whole loop can ride an orbit of its own. Or record a take, which captures the performance over the loops rather than the loops alone.
Prefer a grid? The pad version is the same instrument with sixteen scale-locked pads instead of keys — easier under a thumb, impossible to play a wrong note on.