How can i get an audio mixdown from Cubase LE 4 to work with my ipod.?

I made a .wav file that plays on itunes, but when i try to play it on my ipod it gets screwed up. I have tried a bunch of free converters, but none of the free ones support my .wav file. The only one that has worked is the MP4 Converter, but it only converted 90 seconds before i would have to buy it. I just need a good free converter or anything else that will help