I hope that the posting of links that link to webpages outside of this site is allowed. If it is prohibited, please excuse this newbie for doing so.
You can find the pinout here:
Dell Axim X5 interface port and USB cable pinout and signals @ pinouts.ru
If the link above gets chopped, search google for axim x5 pinout and you will find what you are looking for.
No audio on this connector though as I looked at it on the above linked page.