Harmony
The HARMONY block — build a chord PROGRESSION by walking the circle of fifths, then wire it into your instruments. Pick a key and the diatonic chords light up at their wheel positions (majors outer, minors inner — adjacency is harmonic closeness); click to drop a chord onto the timeline, re-voice its quality / inversion, or type roman numerals. Its note output drives any voice; bind a Clock to play the progression. The theory lives in the kernel; the wheel is the control.