pmv

I have a NWz-s639f which is excellent. I also have an a818 which I still use, and an nws706. I don't use the last one any more because I can't be bothered using sonicstage and keeping a duplicate of all my music in atrac format (I have all my cds ripped to mp3 with wmp11). Was wondering if there was any way to get the 706 to work with the same mp3 files and wmp11 as the other two so I can use all three without any messing around. A 3rd party firmware hack? A WMP11 plug-in? Thanks for any info.