// build a chord chart in any key, see which scales fit which sections, hear it back on sampled classical guitar, and click out chords on the fretboard //
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FRETBOARD → CHORD IDClick a fret to place a finger · ● toggles mute · cyan/amber rings show scale membership
Frets 0–4
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Place some fingers on the fretboard
Chord ↔ scale compatibility runs on a 12-tone engine. World scales / maqams are pulled from the Scale Machine's library and shown at their nearest 12-EDO approximation (same rounding the Scale Machine uses for guitar) — quarter-tone precision lives over there. Chord harmonization into "in key" suggestions only applies where a scale still has 7 distinct tones after rounding.