The website downloads.khinsider.com has a bunch of game OSTs. But out of all the mp3's I downloaded so far, only two of them work in MotorStorm Arctic Edge's custom soundtrack feature. Just for the record, MotorStorm Arctic Edge has this dumb rule that an mp3 has to be 256 kbps or less and it has to be 44.1 khz. So I checked and made sure that 8 of the mp3's I downloaded do in fact fit this criteria. But despite that only 2 of them work. What's causing the other 6 not to work? They show up in the in-game playlist, but the game won't let me enable them, if I press X it just gives a message saying it has to be ≤256 kbps / 44.1 khz. I had a theory though, maybe the non-working mp3's have a variable bitrate and that's why they don't work? I honestly don't know. I don't know how to check for that. When you look at the file details on PC or PSP it just gives a single number no matter what. Also, I found a soundtrack in which every single song is 128 kbps and 44.1 khz, but then I download a few of them and boot up MotorStorm Arctic Edge and for some reason they don't work either! So I have no idea what the problem is!