The 'Master' and 'Gain' sliders on the main tab (in the control panel) for an overall boost. You can play with the other Mixer/Gains sliders as well for a (actually less) balanced soundstage when downmixing to two channels (attempting to boost dialouge for example).Deepak said:That sound problem is solved using AC3Filter but now I have my headphones and WMP, both at max sound and I hear everything at acceptable volume. Can I boost sound from AC3Filter? How?