[Velocimeter]

Well, I'd give the same tips as the last post I posted on your You're The Reason remix post.
On big problem with this track is that it is being played in the wrong scale. You can do 1 of 2 choices: Pitch the vocals down or make the scale fit the acapella's scale. The vocals has chords and part of those chords are the bass notes which you can follow to detect the right scale