Is there a good way to avoid crackles when unmuting? I have modified this example:
http://code.compartmental.net/minim/examples/AudioOutput/SineWaveSignal/
to only play when the mouse button is down, but it crackles a bit when I press and realease the mouse button. Is there some easy way to avoid this?

Here is the code:

import ddf.minim.*;
import ddf.minim.signals.*;

Minim minim;
AudioOutput out;
SineWave sine;

void setup()
{
 size(512, 600, P3D);

 minim = new Minim(this);
 // get a line out from Minim, default bufferSize is 1024, default sample rate is 44100, bit depth is 16
 out = minim.getLineOut(Minim.STEREO);
 // create a sine wave Oscillator, set to 440 Hz, at 0.5 amplitude, sample rate from line out
 sine = new SineWave(440, 0.5, out.sampleRate());
 // set the portamento speed on the oscillator to 200 milliseconds
 //sine.portamento(20);
 // mute the line out
 out.mute();
 // add the oscillator to the line out
 out.addSignal(sine);
 out.printControls();
}

void draw()
{
 background(0);
 stroke(255);
 // draw the waveforms
 for(int i = 0; i < out.bufferSize() - 1; i++)
 {
   float x1 = map(i, 0, out.bufferSize(), 0, width);
   float x2 = map(i+1, 0, out.bufferSize(), 0, width);
   line(x1, 50 + out.left.get(i)*50, x2, 50 + out.left.get(i+1)*50);
   line(x1, 150 + out.right.get(i)*50, x2, 150 + out.right.get(i+1)*50);
 }
}

void mousePressed()
{
   out.unmute();
}

void mouseMoved()
{
   float freq = map(mouseY, 0, height, 1500, 60);
   sine.setFreq(freq);
   // pan always changes smoothly to avoid crackles getting into the signal
   // note that we could call setPan on out, instead of on sine
   // this would sound the same, but the waveforms in out would not reflect the panning
   //float pan = map(mouseX, 0, width, -1, 1);
   //sine.setPan(pan);
}

void mouseReleased()
{
 out.mute();
}

void stop()
{
 out.close();
 minim.stop();

 super.stop();
}