Just extending the cable won't work.

We paid for some engineering to do this very thing. We have had successful tests up to 100 feet. It was not cheap and the wait for parts is long...about 8-12 weeks for the surface mount components used in the buffering circuits.

I guess I'm just throwing this message up to say that anything can be done if you're willing to spend the money. In this case, more than three times the cost of a 40GB player.

Cheers!