Hi Mitch. Yeah, I couldn't get sync to work for frequency either. I guess we should file that as a bug.

The only refinements I would make is to put the code to update the envelope in a separate thread and spork it.

Envelope e => blackhole;
440 => e.value;
SinOsc s => dac;
0.1 => s.gain;
100::ms => e.duration;

spork ~gliss (100::samp);
while (1)
{
Math.random2(220,880) => e.target;
second => now;
}

fun void gliss(dur updateRate)
{
while (1)
{
e.value() => s.freq;
updateRate => now;
}
}

//------------------------------------------------------------

On 09/03/2015 07:13 PM, Mitch Kaufman wrote:

Hi list,

I am a relatively new user and am enjoying exploring different areas of ChucK. I was trying to develop a program to create glissons or short particles with a moving frequency range. I came up with an approach but I think there may be an easier way. Here is the program:

SinOsc sin => dac;
Envelope env => blackhole;
500.0 => sin.freq => float x; //starting frequency
100::ms => dur rampTime; //ramp time period
0 => env.value; //starting value
rampTime => env.duration;
400.0 => env.target; //ramp to target - in this case, 900 Hz
now + rampTime => time t;
while( now < t )
{
    // modulate frequency by envelope
    x+env.value() => sin.freq;
    // advance time by 100 samples
    100::samp => now;
}

I think there may be an easier way of doing this using:

Envelope env => SinOsc sin => dac;

But I can't seem to get it working using a proper sin.sync value. Does anyone have any ideas on improving the approach?

Regards,
Mitch
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