i have reconverted the audio files. The originals are 44100/128k. These ones are 22050/64k.
So you can try with these and see if you get higher speed.
EDIT: and here is how i have it in the caanoo, which is working for me.
http://www.megaupload.com/?d=JQQ5PFZB (complete game with reconverted audio files and bgd runtime for caanoo)
Just unzip it in the root of the SD card, and launch the executable via the file explorer.
P.S: if i'm not allowed to post that files, mods feel free to edit my post as convenient.
thanks for the work bro!!!