I would start by removing the embedded HTML from your code. HTML::Template should suffice very nicely. And start using POD ... multiple hashed comment lines are ugly and make the code less readable. POD makes your code look professional at the additional advantage of providing readable documentation.

Just looking over your code, i get the feeling that it was thrown together rather quickly. Maybe you should start over, design it first this time -- it's much easier now that you have figured out the requirements.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)