thanks for your reply,
I download everything, and rename things accordingly but it still giving me the error "couldn't play"..
Here's how the SD look like :
(F) 3DS
(F) boot9strap
(F) Nintendo 3DS
boot.3dsx
boot.firm
otherapp.bin
safehaxpayload.bin
soundhax-eur-o3ds-post5.0.m4a
(Can't post...