i write songs with acoustic parts, but for the amount of electric playing i do, i makes more sense to play them on clean electric. i also think that its great that they dont reproduce the albums exactly, if i want to hear that, ill listen to the album, i want to hear how they can possibly play that shit live, with all the changes, and still not fuck up. and for the acoustic parts live, i am pretty sure mikael and peter have piezo pickups on their guitars, they would sound acoustic, but they sound alot more natural than regular electric guitars.