I manage and run BinauralBeatsTips.com and there, I have a number of resources for you to discover how you can make your own binaural beats and isochronic tones audios. A simple process really, or you can browse through the resources section to find something that peeks your interest.
You may be looking for premade audios or just want to, like I have done for the past 10 years, do a little experimenting on your own to see what happens.
Brainwave entrainment is something that has studies behind it but it's still fairly new so there is a lot of room for discovery.
Go to http;//BinauralBeatsTips.com to find out more.