Today, it is possible for the average computer user to create their own brainwave synchronization sounds using a software program called
Gnaural -
wiki article -
example files. Gnaural is both a windows and linux based program.
There are other similiar programs for the linux users in the world. Autozen, for linux, comes to mind.
There may be others that I am unaware of and if you know of any, feel free to mention them here.
If you dabble with this technology, feel free to share with others what you have created.