A UGen that converts a control-rate trigger input into an audio-rate trigger
output. A trigger occurs when a signal changes from less than or equal to zero
to greater than zero. The output will have a single sample spike of the input
trigger's amplitude at the beginning of the calculation block.
// up-sample control-rate impulses
val trig = Impulse.kr(MouseX.kr(1, 100, 1))
Ringz.ar(T2A.ar(trig), 800, 0.01) * 0.4
control-rate trigger input