While I can't attest to their quality or usefulness there is a bunch of
forex audio tracks available on Amazon under the banner of 'Forex Trading Secrets'.
A quick google and I think this might be part of
Peter Bain's forex course.
The
Trading Institute MP3 seems to be much better value for money.
Lastly there's the
Forex Success Group Course.
After you get the basics down it's important to expand your reading (& listening into other areas).
Using my own
trading recommendations list as a starting point I know that you can buy audio versions of Think & Grow Rich, Trading in the Zone, Dancing Wu Li Masters and Holographic Universe.