The program was designed to allow communication via skype etc. while having other audio sources active. It lowers the selected audio volumes when the volume level from another audio source goes over a user set threshold. With two possible ducked sessions you can actually lower the volume of two selected audio sources at the same time (like audio/video player and a game).
Nothing alike on the market (at least I can't find). Some other software have this effect built in, but Degath's Ducker allows it's user control over the triggering session, ducked sessions, the audio level when ducking is active, time while audio level stays low and the fade in time. This amount of control with the fact that there is nothing alike makes this a rather unique software.
Anyone who likes to use voice communication software while listening to music, gaming or watching movies (anything with audio).
Please see the programs homepage for the latest version!