ToggleFF

A UGen that toggles like a flip-flop between zero and one upon receiving a trigger. The flip-flop initially outputs zero and changes to one when the first trigger arrives.

===Examples===

// mouse-button toggle
play {
 // make sure lag is zero, otherwise the output
 // never falls back exactly to zero!
 val tr = MouseButton.kr(lag = 0)
 val ff = ToggleFF.kr(tr)
 SinOsc.ar(ff.mulAdd(400, 800)) * 0.1
}