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OpenCart also has multi-store support that lets you stay on top of different stores from a single interface. This functionality lets you set products for different stores, use specific themes for each online store, and localise your websites. Product options and attributes are also quite flexible with OpenCart, and the solution lets you add extra product variables.
You can play the songs before downloading them, but when you're ready to save the songs to your computer, click the FREE button to add it to your cart. Then, you can check out as if you were purchasing something by clicking Place your order. You'll be taken to a link to download the free music, and it'll also be saved in the Digital Orders tab of your order history.