Microtones

A semitone, progressively subdivided.

Loop

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Root note

Timbre

Bars

Note length

Pause between bars

Bar n splits 100 cents into n equal steps, and the last note of each bar is held so you can land on it.

Most listeners tell successive pitches apart somewhere around 10–25 cents, so the later bars sit at the edge of what human hearing resolves. If bar 6 turns to mush, that is the ear working normally — bars 1–3 are where the training actually happens.