Volume Control

[maxpower]

Hi,

I am looking into methods of fading out a synth that can be set dynamically.

For example if one is to use an EnvGen.kr(Env.adsr,gate) the gate can be set with

Code:

s.sendMsg("/n_set", n, \gate, 1)

; etc but... if I set the 

Code:

s.sendMsg("/n_set", n, \gate, -61)

  and then decided - during the period it is fading out - that I want it to fade faster, slower or not at all.  Well an envelope just will not do this.

My solutions so far are:
 

Code:

Out.ar(out, z * mul.lag(x))

where mul and x are arg's
set like this

Code:

s.sendMsg("/n_set", 1990, \x, 20, \mul, 0.1 );

or
 

Code:

Out.ar(out, z * mul

) where the mul arg is set with a Routine

Both seem to work fine...but are there other ways that are better?

[dewdrop_world]

That's tricky... EnvGen sets its parameters for each envelope node and doesn't update the rates etc. until the next node.

However, there is this:

Forced release of the EnvGen

If the gate of an EnvGen is set to -1 or below, then the envelope will cutoff immediately. The time for it to cutoff is the amount less than -1, with -1 being as fast as possible, -1.5 being a cutoff in 0.5 seconds, etc. The cutoff shape is linear.

e.g.,

Code:

// this is to prove how long the release really takes
o = OSCresponderNode(s.addr, '/n_end', { |t, r, m| [t, m].postln }).add;

(
SynthDef(\envtest, { |gate = 1|
var sig = SinOsc.ar(440, 0, 0.1),
env = EnvGen.kr(Env(#[0, 1, 0.8, 0], #[0.1, 4], releaseNode: 1),
gate, doneAction: 2);
Out.ar(0, (sig * env) ! 2);
}).memStore;
)

a = Synth(\envtest);

(
a.set(\gate, 0); Main.elapsedTime.postln;  // start normal release rate
{ a.set(\gate, -1.5) }.defer(0.5);  // force 0.5 second cutoff
)

// clean up
o.remove;

The difference between the posted times should be about 1 second.

hjh