Exporting iMusic onto a USB once converted

Hi,

I have iMusic playlist on Rekordbox and have converted the files to wav files which I can play from the computer and can get the sound to come through my Pioneer  DJRX3, but the files will not show up on the screen and I can only control the playlist from the computer, including sound, mixing etc.

I would like to export the iMusic folder to a USB so I can plug in in direct to the DJRX3 and take control of the playlist that way. 

Can someone help me please?? 

I have subscribed to Rekordbox but feel i'm not getting the best from the application and becoming frustrated. I am actually after some older music, and the DJ music apps don't have what I am looking for, where as my iMusic has everything I need.

Cheers

Tammy