tuning D A G · just intonation to the D drone · 1/1 = 146.83 Hz
the ground — D & A the signature — F (6/5) & B (5/3) outside the mode
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Tuning
Reference (open D)
146.83 Hz
Modes
The ground
Tap a string to drone it; both is the open fifth. Spacebar toggles both, Escape stops. The strings glow when a played note rings them sympathetically.
D
bass drone · 1/1
A
middle drone · 3/2
nearest degree
—
deviation from just
— ¢
listening…
beats vs D: —beats vs A: —
The board
Click a fret to pluck it. Hold a key to sustain — melody 1–8, middle Q–I, bass A–K. Each fret shows its just interval above D.
The seven triads
The tonic Dm and the major III (F) and IV (G) lock against the drone; the others carry the comma.
Sequences
Ear-first phrases
Drone-relative shapes to imitate by ear, not read. Set the drone, then loop a phrase or use call-and-response — it plays, then leaves an equal silence for you to answer on the wood.
Core exercise. Drone D + A, then play 1 3 4 6 4 3 1 and hear each degree settle. The loop. Hold A+Q+3 → D+Q+7 → F+W+1 → A+Q+3 (i → III → IV → i).