Android Xperia X10 Soundpool

I have had some reports from users of my android app that there is no sound being played on the X10. I'm a bit confused as it works on all other phones that I have tried, Neus One,

Solution 1:

I fixed my similar problems (see comments above) by converting my MP3s to Oggs and using MediaPlayer rather than SoundPool. I'm not sure which of the two changes was responsible for the fix as I don't have an X10 to test on but users reported that the new version now works.