This port supports msu-1 audio.  Any tracks where a file isn't 
provided will fall back to the NES A203 emulated sound file.

Tracks:
0 - intro video
1 - Zone 0
2 - Zone B
3 - Zone D
4 - Zone G
5 - Zone J
6 - Zone A
7 - Zone F
8 - title
9 - Ending
10 - overworld
11 - Boss
12 - Game Over
13 - Bonus Stage
14 - Invincible
15 - Life Lost
16 - zone clear
