Edit read on for some info below but a quick link list: Specs: http://loveemu.yh.land.to/page/NDS/SDAT.html http://kiwi.ds.googlepages.com/sdat.html Preferred tool for ripping: ndsdnsext http://nintendon.s6.xrea.com/ Second link down on the left or ?????? Original post: As the topic says some people have worked at reverse engineering the sound files of the DS and have got reasonably far in doing so. http://d.hatena.ne.jp/loveemu/20060114 The original site gives me a SQL error but you can download the tool here: http://djbouche.net/dl/sdattool0.32.rar The original site: http://djbouche.net/sdat!sdattool (google has it cached) Oh and for those that care Tony Hawks A.S. uses STRM so a custom sound track should be almost trivial and could probably even be done with a batch file and a few tools. Now if you will excuse me this has just given me a lot of new stuff to play with now.