Hey chromemike,
I’m not quite sure what exactly you want it to happen…
So do you want to only allow people who paid to play your music?
And is your site a membership based?
And which e-commerce plugin are you using?
We will need more details to help you…
Vibedeck is garbage, the site is down more than it is up. Band-camp is reliable but it takes your customers out of your site and no cart integration. Nimbit is useless and i have no idea about easy file shop. You need a music player and a shopping cart. They are two separate things and you should treat them that way.
I had to make my own music player as I really didn’t find anything out-there that would work and wouldn’t take the customers away. I feed it with XML song lists and it works well. It’s a copy righted software now so i can’t share with you but you can see the site I did for a composer in Australia, checkout the shop page and snoop around. (don’t use IE, it probably wont work)
http://elio.net.au