Hmm, can't really say until I can visualize the application you're working on fully.
Could you explain more about how the page and application would work?
But more than likely, Yes, you are correct. Individual buttons to access individual tracks.
Another Method if comfortable in flash:
Build one giant full flash page to produce the application, giving you absolute Button, Sound, and everything control. Then you could skip the "making SWFs talk" cuz you'd be in one SWF the whole time(whole page). BuyNow buttons also work in flash if needed.
Explain your APP to us a little more if you have a sec.