Stage 3 / Agent E — the performance layer.
- fireDrum(name,vel,durMs): one shared fire path for the sequenced beat and
the played keys; seqTick's drum branch routed through it (behavior identical).
- Keys 1–5 play kick/snare/clap/hat/ohat while the beat panel is open (vel 0.9,
⇧ = 0.5 ghost); ev.code with an ev.key fallback for code-less environments.
- ⏺ rec toggle (beat.rec, red when armed): each tap quantizes to the nearest
16th (round seqPhase % 16) and writes steps[n]/vel[n], repaint via beatRefresh.
- exportMid: a channel-9 GM drum track (36/38/39/42/46), the beat looped across
the arrangement's bars, one 16th long; ratchets omitted in v1. Added before the
bail check so a beat-only export still produces a file.
Territory: openBeat header, keydown, seqTick, exportMid + one #beat CSS rule.
Nothing inside the Synth IIFE; no ctx-menu entries.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
monsterrobotparty
bd3340d4a2