I am looking to sell audio files. I want each product to have 3-5 different formats to choose from. I want the user be able to choose which file type they want on the product page.

any hints on how to make this happen?

here is an example of what i am talking about:
http://www.loopmasters.com/product/details/1212/Hip-Hop-Instrumentals

in the center of the page there is a table set up with different options to choose from

here is another example where the selector is a drop down selection:
http://primeloops.com/loops-samples/product/dubstep-gladiators~1028/#

thanks for the help