MouseButton mouse button ugen
superclass: UGen
*kr(minval, maxval, lag)
minval value when the key is not pressed
maxval value when the key is pressed
lag lag factor
see also MouseX, MouseY
//example
{ SinOsc.ar(MouseButton.kr(400, 440, 0.1), 0, 0.1) }.play;
{ SinOsc.ar(MouseButton.kr(400, 740, 2), 0, 0.1) }.play;