The ARMJAM — Jammer — spins its fork at 100°/s from Activate (COB spin fork z c18204) and stops it on Deactivate. The preview runs 2 turns (7.2 s) and freezes the stop on the next full turn (720° = identical matrix — the spin-family freeze convention), so the loop closes pixel-identically. StartMoving/StopMoving only drive engine-side emit-sfx wake anchors.
Animation
PNG frames
Frame 0 / 1190.00 s
COB timeline (ARMJAM.cob)
- 0.00–0.40 s — Rest - fork idle
- 0.40–7.60 s — Fork spins at 100 deg/s (COB spin fork z c18204; preview: exactly 2 turns)
- 7.60–8.00 s — Frozen - the stop lands on 720 deg (COB Deactivate), loop close
All motion is compiled COB; the wake waves are engine-side emit-sfx. Seam gate: frame 0 == frame 119 (the frozen rest beat). 120 PNG frames at 67 ms.