If you are feeling brave, and fancy playing around in the developer image, there is some information and code on the developer site to allow you to push a raw file out of the empeg (using dd if memory serves)
I don't know if it would work on a Mk2 though, as I need to sort out my cross compiler...

So it is possible, just not from the player software at the moment... =)

Jazz
(List 112, Mk2 12 gig #40. Mk1 for sale 4 gig #30, apply within)