Since the last update...

Every time you launch the app. It asks for the apple store id.

And when you reach the end of the music it starts again. So you never know when the end of the session is. It loops.

The sounds for sale through the appllcation are also available for downloads as mp3s on the online unexplainbale store site. So you should be able to transfer the sounds you buy through the app on your ipod or iphone or even on you mac or windows pc. But i didnt find this possibility.
So my advice is not to buy any sound through the application.

I hope a further update will make this possible.

Chris723us about Brainwaves -- Binaural Beats, v2.0