Starts a linear raise by rate/sec from zero when trig input crosses from non-positive to positive.
When rate == 1, Sweep may be used to get a continually-updating measurement of the time (in seconds) since the last trigger.
| trig |
triggers when trig input crosses from non-positive to positive. |
| rate |
rate/sec raise 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 bufferb = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01.wav");({ var trig; trig = Impulse.kr(MouseX.kr(0.5, 10, 1)); BufRd.ar(1, b, 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, b, 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, b, Sweep.ar(trig, BufSampleRate.ir(0) * rate))}.play;)b.freeSweep can be used as a resettable Phasor or Line - one that can start, pause, resume and stop. To get a resettable XLine behavior change the linlin to linexp in the SynthDef below.
xxxxxxxxxx(SynthDef(\lineReset, { |out, start= 0, end= 1, dur= 1, t_trig= 1, run= 1| var phasor = Sweep.ar(t_trig, run / dur).linlin(0, 1, start, end, \minmax); phasor.poll; Out.ar(out, SinOsc.ar(phasor, 0, 0.2));}).add;)a = Synth(\lineReset, [\start, 400, \end, 800, \dur, 2])a.set(\t_trig, 1)a.set(\run, 0)a.set(\run, 1)a.set(\t_trig, 1)a.free//shorter duration and downwards...a= Synth(\lineReset, [\start, 1000, \end, 500, \dur, 0.5])a.set(\t_trig, 1)a.set(\run, 0)a.set(\run, 1)a.set(\t_trig, 1)a.free