Found exclusively on John Deere 900-Series Tracked Feller Bunchers, the optional Rapid Cycle System (RCS) delivers faster, low-effort operation, using a single joystick to control all boom functions. RCS combines automated felling-head arm cycling with simple boom control, dramatically reducing operator motion and fatigue, while increasing efficiency and productivity. The system shortens the learning curve and maximizes performance and can be tailored to individual skill levels. RCS can also be adjusted to match specific harvesting conditions, from large single-tree harvesting to high-speed, multi-stem cutting.
See it demonstrated here