The Bauer stereophonic-to-binaural DSP (bs2b) plug-in is designed to improve headphone listening of stereo audio records. Recommended for headphone prolonged listening to disable superstereo fatigue without essential distortions. A description is available at bs2b.sourceforge.net
I wasn't able to notice any real difference with this working though it did not mess the audio output when active so experience may differ for you.