Sweep triggered linear ramp

superclass: UGen

starts a linear raise by rate/sec from zero when trig input crosses from non-positive to positive 

*ar(trig, rate)

*kr(trig, rate)

// using sweep to modulate sine frequency

(

{ var trig;

trig = Impulse.kr(MouseX.kr(0.5, 20, 1));

SinOsc.ar(Sweep.kr(trig, 700) + 500, 0, 0.2)

}.play;

)

// using sweep to index into a buffer

s.sendMsg("/b_allocRead", 0, "sounds/a11wlk01.wav");

(

{ var trig;

trig = Impulse.kr(MouseX.kr(0.5, 10, 1));

BufRd.ar(1, 0, Sweep.ar(trig, BufSampleRate.ir(0)))

}.play;

)

// backwards, variable offset

(

{ var trig, pos, rate;

trig = Impulse.kr(MouseX.kr(0.5, 10, 1));

rate = BufSampleRate.ir(0);

pos = Sweep.ar(trig, rate.neg) + (BufFrames.ir(0) * LFNoise0.kr(0.2));

BufRd.ar(1, 0, pos)

}.play;

)

// raising rate

(

{ var trig, rate;

trig = Impulse.kr(MouseX.kr(0.5, 10, 1));

rate = Sweep.kr(trig, 2) + 0.5;

BufRd.ar(1, 0, Sweep.ar(trig, BufSampleRate.ir(0) * rate))

}.play;

)