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