I'm not a fan of long texts, so I'll make it shorter. I've been playing AR=9 songs for along time now, and today I played with my friend in multiplayer, and..well...I sucked balls, more than usual like 60-78% accurcy. Then I try some AR=10 songs, and just completely blown away, i would get 90%+ accurcy and do way,way,way better than AR=9. SOooOOOOo, any explanations?