personally I don't think the evo has what it takes to be a music device.
the integrated headphone amp is junk, it can't even drive some of my less sensitive phones without distortion. BOOOOOO!!!!
I tried with both my Shure E4c's and some nice sennheiser circumaural phones (PC350).
I'm going to try with my etymotics next week but frankly it just doesn't seem like it can do it.
now if you're listening on el-cheapo iPod headphones you're probably OK but if you know what music should sound like you wont be happy.