Retrigger attack on ADSR

[wheeler]

I have a SynthDef with an Env.adsr. I’d like to externally retrigger the attack, without releasing the synth (and thus freeing the node). Is this possible?

[dkmayer]

That’s a very good question: at first it seems there must be a super-straight solution but I haven’t found one that is simpler than Eli Fieldsteel’s elegant suggestion:

Retriggering/Resetting a Sustained Envelope

I think you can cook something up with an “upside-down” trigger argument…does this do what you’re envisioning? s.boot; ( x = { var env, sig; sig = PinkNoise.ar(0.2!2); env = EnvGen.kr( Env.adsr(0.01, 0.5, 0.1, 1, 1, -2), (1 - \trig.tr(1)) * \end.kr(1), doneAction: 2 ); sig = sig * env; }.play; ) x.set(\trig, 1); //retrigger x.set(\end, 0); //fade

By snooping the forum you’ll find a lot of threads about envelope (re-)triggering. It’s a quite complicated topic, also the extensive Env/EnvGen helpfiles indicate that …