How can I use EnvGen in a loop in such a way that it won't restart at every iteration of the loop?
What I need it for: piecewise synthesis. I want e.g. 50ms of a xfade between first and second Klang, then a 50ms xfade between second and third Klang, then a 50ms xfade between third and fourth Klang and so on, and I want this concatenation as a whole to be modulated by an envelope.
Unfortunately the EnvGen seems to restart from the beginning on every iteration of the loop that plays the consecutive Klang pairs. I want a poiiiiinnnnnnnnnng, but no matter what I try all I get is popopopopopopopopo.
2019 EDIT:
OK, since nobody would answer the "how to achieve the goal" question, I am now downgrading this question to a mere "why doesn't this particular approach work", changing the title too.
Before I paste some code, a bit of an explanation: this is a very simplified example. While my original desire was to modulate a complicated, piecewise-generated sound with an envelope, this simplified example only "scissors" 100ms segments out of the output of a SinOsc, just to artificially create the "piecewise generation" situation.
What happens in this program is that the EnvGen seems to restart at every loop iteration: the envelope restarts from t=0. I expect to get one 1s long exponentially fading sound, like plucking a string. What I get is a series of 100ms "pings" due to the envelope restarting at the beginning of each loop iteration.
How do I prevent this from happening?
Here's the code:
//Exponential decay over 1 second
var envelope = {EnvGen.kr(Env.new([1,0.001],[1],curve: 'exp'), timeScale: 1, doneAction: 2)};
var myTask = Task({
//A simple tone
var oscillator = {SinOsc.ar(880,0,1);};
var scissor;
//Prepare a scissor that will cut 100ms of the oscillator signal
scissor = {EnvGen.kr(Env.new([1,0],[1],'hold'),timeScale: 0.1)};
10.do({
var scissored,modulated;
//Cut the signal with the scisor
scissored = oscillator*scissor;
//Try modulating with the envelope. The goal is to get a single 1s exponentially decaying ping.
modulated = {scissored*envelope};
//NASTY SURPRISE: envelope seems to restart here every iteration!!!
//How do I prevent this and allow the envelope to live its whole
//one-second life while the loop and the Task dance around it in 100ms steps?
modulated.play;
0.1.wait;
});
});
myTask.play;
(This issue, with which I initially struggled for MONTHS without success, actually caused me to shelve my efforts at learning SuperCollider for TWO YEARS, and now I'm picking up where I left off.)