A pair of signals x and y are treated as a point (x, y) in 2-D; if they fall within the bounds of the rectangle, then this UGen outputs a one; else it outputs zero.
| x | X component signal. If  | 
| y | Y component signal. If  | 
| rect | A Rect which defines the rectangular region to monitor; note that Rects are in screen co-ordinates, so the top is smaller than the bottom. The Rect is created once and cannot be modulated. |