REPLACED BY MULTI TOOL
2-sided warp (and stretch) selected events in lane under mouse:
* Events to the left of the mouse are stretched separately from events to the right. Moving the mouse up or down warps the events toward or away from the mouse.
* Useful for changing a linear ramp into a more complex logistic-type curve.
* Useful for accelerating and decelerating a series of evenly spaced notes, as is typical in a trill.