1–12 Sound Playground
Press, hold, combine, and compare numbered notes and movable major scales.
Computer keyboard1–90 or * = 10− = 11= = 12O = octave downP = octave upEnter = next
Press and hold a number to hear it.
Play scale from
Just tuning uses pure major-scale ratios around one selected key. Equal temperament unlocks every key.
Hold a pad to sustain it and release to stop. Hold multiple pads to hear the tones together.
Odd tonic: 3 consecutive odds → 4 consecutive evens → tonic
Even tonic: 3 consecutive evens → 4 consecutive odds → tonic
From 1: 1–3–5–6–8–10–12–1From 2: 2–4–6–7–9–11–1–2