Piano Roll

The pitch × beat note grid a melodic module needs: time left to right in beats, pitch bottom to top like a keyboard, every note a block drawn at its own beat and pitch, and the whole loop rendered at once — no virtualization, the deliberate choice for a short loop shown whole. A two-tone grid keeps bars, beats and sixteenths countable while it plays; row stripes read the octaves; the keyboard gutter names the naturals. The playhead is a prop the host drives from its own clock, and when it is null the cursor and its bar.beat.sixteenth readout are simply not drawn — a stopped transport shows no line pinned at zero. Notes are selectable and lit with the accent; an experimental edit mode lets a selected note move or stretch with optional snapping, behind a flag until a sequencer consumes it. Every colour is a --uikit-* token, so an embedded roll follows a host that repaints per mode with no prop passing.