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I run OS Commerce alongside XOOPS separately rather than using the module. I had trouble with the module, IMO it's a lot of hassles without much benefit. If you wanna sell records with OSC checkout:
http://www.vinylwarning.com.au/
also checkout
http://www.beatport.com for download sales.
Http://www.netjuke.com is also pretty cool as a web jukebox.