I've often heard about this hemi-synch sound approach to meditative discovery, if that's a useful name for it. I believe originally developed at the Munrto Insititute in Virginia, IIRC. I knew one guy who went off to do the regimen there on-site, and although he seemed very happy with the experience, he did become something of a flake, leaving his wife and two children and pursuing a career involving numerology or something of the sort. So I really don't know what he experienced, as we lost touch.
How would you describe your adventure with it so far?