C# 13b9 — Mono Synth

C# 13b9 is built from C# – D – E# – G# – A# – B. On the Mono Synth those tones land as real keys, and every chart below names the tone under each one — root position first, then the shapes that earn their place: inversions, the open spread, the 1-3-7 shell.

The Mono Synth sounds one voice across its 37 keys (C2–C5), so a chord is never a stack here — it is a sequence, and the charts number the order your fingers roll.

Under this keyboard's own voice architecture the engine reports: arpeggiated — 6 notes rolled low to high: root, b9, 3rd, 5th, 13th, b7.