I tried mixzing and from the write ups don't want to bother with btune. My phone is running Smoked Glass 6.0 with the new music player 3 and it is great. Fast, cover art and all the good stuff. The volume control works while the phone is locked and the screen is off.
For all those who are afraid of "rooting" it is worth it. Faster better and very stable.
Btunes is fast, download album art, or uses tagged album art, and you can turn up the volume while the screen is lock and off.....