Holosync does indeed work. No doubt about it. But it will only take you so far. Holosync is fine if you're looking for a veritable Disneyland for the brain.
However, the simplest techniques are often the most powerful in the long run. Here's one that's free and doesn't require much time to do. And yes ... you can use it to supplement your Holosync practice or any other, for that matter.
Check it out at http://www.hereandnowmeditation.com/English/contents.html
shr33m
