[chuck-users] Newbie envelope glide confusion

[Tomasz Kaye's brain]

I expected that the following code would give a tone that would glide
to a new frequency each second. But i think I might be
misunderstanding the sync property because i'm not getting any audible
output from this. Can anyone explain where i'm going wrong?

Envelope env => SawOsc osc => dac;
3::ms => env.duration;
0 => osc.sync; // (0) sync frequency to input,

while(true){
	1::second => now;
	Std.rand2f(100,300) => env.target;
}