Key & Scale
The KEY & SCALE block — the patch's master tuning + a note QUANTIZER. Pick a scale system (12-TET, a just intonation, an EDO, or a makam / raga / gamelan tuning), set the tonic, and toggle which degrees are legal on the wheel; wired notes snap to the nearest allowed pitch (microtonally exact). Turn the drone on to hear the tonic. Every Chord Progression set to follow keys off this context. The tuning + membership math is the kernel's; the wheel is the control.