I didn't listen yet, but I can automatically tell your biggest mistake is the reverb.
Never reverb master track. xD
Listening to it: It actually doesn't seem much of a problem, but I'd still pull out the reverb on master.
I'd recommend using a Upright Bass, you're bass is WAY too low, even for bass. Go easy on the harmony, buddy. And I really recommend introducing a full drum kit earlier on, it's hard to carry a song on cruise control bongos. Your drums weren't a problem before, I recommend you keep the ones you had before.
If you download KORE PLAYER, it's got a good upright bass. KORE PLAYER is a free sampler.
If you give me an mp3 version with no bass, I could give you an example of what you could make it sound like based on my suggestions.
With reverb, it sounds much better.
But the reverb's are conflictin, your electric guitar's up nice and close but your horn sounds like it sounds like it's across a stadium.