Well, I've heard it's a myth as well, BUT at least only with Neo Geo Battle Coliseum, the game I'm trying to back-up, it's TRUE that I'll only get a perfect back-up burning at 1x.
Everyone burning at 4x is having the same problems... the music sometimes stop, and the loading sometimes freezes, for a short or big period of time.
There was a guy that recommended to burn at 1 or 2x, but all I could find was a 4x media(I was using 8x, which allows me to burn at 4x minimum), and burned at 2x. The results were BY FAR better, because the music didn't stop anymore, but the loadings sometimes still freeze, even if for a short time now.
And the same guy said that, a perfect back-up, only burning at 1x, that will avoid the loadings problem.
Since everyone with this game is having the same problem, it's not stupid what I'm asking.