José asked: is Pecera where you push MIDI, mic, betting? No. Pecera is watch-only. This Lab is the sandbox that influences Arcade without inventing a fourth campaign mode.
Spectator feed / balcony panel. You look at the pit. You do not drive tempo, bets, or guitar input from here.
MIDI clock → battle time · Mic / guitar → jam later · Versus stake → afterparty bet. Thin hooks into Arcade Stable. One proof is enough for Arcade Complete.
▶ JAM ON — one page: sliders + Arcade iframe (midi_time=1). No tab chaos.
Friend + pads in the same Arcade pit. Not Story rooms. Not a separate universe.
Classic-mechanic remixes (Robotron DNA, rooms, score-flower) + on-the-fly ASCII / pixel skin previews. Not Arcade Complete. Same pit art language.