Chart (modified in place).
Line index.
Event layer index (0 = first layer).
Fractional beat where the event starts.
Fractional beat where the event ends.
Line Y at startBeat (chart space, ±450 is half-screen height).
Line Y at endBeat.
RPE easing type 1–28 (default: 1 = linear).
Add a moveY event to a specific event layer of a line.