gnaural 0.4.20070301-1 (i386 binary) in ubuntu hardy

 Gnaural is a programmable "binaural beat generator", based on the
 principle first described in October 1973 Scientific American, Gerald
 Oster, Auditory Beats in the Brain. There has been considerable
 research done on this principle since that publication, and Gnaural's
 predecessor, WinAural, has even been used as the audio stimulus
 in a study published in the proceedings of Biomedical Engineering
 2004, "The Induced Rhythmic Oscillations of Neural Activity in the
 Human Brain", D. Cvetkovic, D. Djuwari, I. Cosic (Australia), From
 Proceeding (417) Biomedical Engineering - 2004.
 .
 The central idea of the Binaural Beat principle is that brain activity can
 be entrained to the auditory beat frequencies created when each ear
 is presented simultaneously with tones of slightly-differing frequency.
 It has been proposed that entrainment can be used to target specific
 mental states, ranging from restful and meditative to highly alert.
 .
 Gnaural can output directly to your computer's soundsystem, or to an
 audio file (.WAV format), which you can then burn to an audio CD or
 compress to MP3 to make available for portable use. Stereo
 headphones are required to maintain the stereo separation of the
 tones needed for your auditory system to create the binaural beats.
 .
  Homepage: http://gnaural.sourceforge.net/