C# 6sus4 — 4-Voice Polysynth

C# 6sus4 is built from C# – F# – G# – A#. On the 4-Voice Polysynth 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 4-Voice Polysynth allots 4 voices across its 49 keys (C2–C6): enough for most qualities, but the extended colors make the reducer earn its keep — each chart shows the arithmetic.

Under this keyboard's own voice architecture the engine reports: all 4 notes fit — root, 4th, 5th, 6th.