I like the oldskool feel to this
but it feels too all-over-the-place, the melodies are a little too crazy for my taste, and alot of the instruments don't blend together well, in my honest opinion.
I would recommend you just put 1 reverb plugin over this mix, so that it blends together better. When the trombone came in originally, it didn't fit with the instruments there previously.
One thing to remember is that while it's good to have a good amount of variety in your songs, you also have to avoid too much variety, lest you end up with jumble.
It was nearly impossible to sit and just go with the flow of the song because it was really hard to just follow.
In addition, because of the rapid pace of this song, many of the chords were thrown out of whack.
In terms of instruments, I think you might want to improve your selection. Go to my userpage to get a full listing of what I use. You might be interested in downloading a few of those soundfonts (they're all free, btw.)
This song has a lot of potential though. The main problem is that you took a lot of great sections and ideas and combined them together in an unharmonious manner.
While this song will take a lot more work than just a few tweaks, what I suggest you do is take this advice and apply it to another song in the future.
Sorry for the 5, but I'm a pretty tough grader as of late...
Good luck on your future endeavors though, and feel free to send me links to your music if you need advice, and I'll respond as soon as possible.