Ranmamez

Hello. I need to convert in wav pcm one of the song inside the game Need for Speed Carbon - Own the city, for the psp naturally. I tried many sound applications but never had any luck, so it seems that this song (and the others too, naturally) is in atrac3 plus codec. How can I easily convert this song? But first, how can I check that's really in atrac3 plus codec? Thanks in advance!