I had to return this CD twice and ask for a refund. Both copies where faulty, with the binaural beat or isochronic tone only sounding in one channel, and not both ears. I emailed BrainSync, the producers of Kelly Howell's `Brain Power'CD, and they said it shouldn't be like that, and that it was faulty.
The trouble with CD and DVD manufacture is, is that when things go wrong it will be many CDs down the line before anything is spotted, if at all; thus a shop like Amazon buying in stock will probably have its entire stock of that CD faulty.
I still intend to buy `Brain power', but it will have to be from another shop now.