double crossfade = (double)fadeDurationSlider.getValue()/1000;
if(fadeInOutChunks.isSelected() & crossfade > 0)
composer.addCommand("fade("+crossfade+")");
if(crossfadeChunks.isSelected() & crossfade > 0)
composer.addCommand("crossfade("+crossfade+")");
if(reverseChunks.isSelected())
composer.addCommand("reverse");
if(addGainChunks.isSelected())
{
double gain = Double.parseDouble(gainValueField.getText());