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Xen Theory
← Xen Theory

JI Composition Trainer

Master just intonation through interactive exercises

Adaptive Interval

Build JI intervals from prime ratios. Adaptive difficulty unlocks new intervals as you master them.

Adaptive Chord

Build JI chords note by note. Master triads, seventh chords, and their inversions.

Piano Roll Onslaught

Place notes on a vertical piano roll to match spawning targets. Navigate with JI ratios in any EDO.

Keyboard required. Use number keys (1-0) for prime ratios, letter keys (Q-P) for reciprocals.

Settings & Key Mappings

JI Composition Trainer - Build just intonation intervals and chords from prime ratios