An isochronic tone is essentially an audio tone modulated by a square wave at the entrainment frequency to produce pulses at the entrainment frequency.  I can't find any currently available Audacity plug-ins that do this.  You may want to get the Nyquist language docs and look at some of the available Nyquist plug-ins for Audacity and write one.  Probably need to be able to set the tone (in Hz), the entrainment frequency (maybe in Hz or msecs depending on how you control the on/off of the tone) and the duty cycle of the pulse (in %).

Nyquist is a LISP variant and designed for the non-programmer.  As such, Nyquist is targeted toward the musician and many of the terms will tend to be more sound oriented.  Nyquist functions tend to be short, usually 5 to 10 lines but often just one with any commands.  The rest is documentation for others or for the program using the plugin.

Once you get a plugin working for this, you might want to experiment with cross feed, low pass filtering or panning for entrainment.

Dr. Richard Price
RCP Consulting
http://www.rcpconsulting.us

Special Limited Time Offer - Super Lucid Dreaming  AND Creating Your Own Brainwave and Subliminal Programs with Open Source Tools  (including support) Specially Priced - Click Here for the Special Offer .  Free shipping to the continental US.

--- In bwgen@yahoogroups.com, "Rob" <robmaggs@...> wrote:
>
> Hi, can anyone tell me how to create Isochronic tones? I understand
> how to make binaural and monaural files with Audacity but isochronic
> tone creation remains a mystery to me. Please help.
>
> Many thanks
>