I am building a Website that sells mp3s as downloads. I installed the e-commerce and digital downloads add-ons and want to configure a custom attribute so that when a song gets listed for sale it has a link to play a preview of the file. This is a little beyond me and I would like assistance or to pay someone to create this for me. I would like the audio player to not be flash-based. I need the Website to display and function well across mobile platforms.