A Download doesn't require anything different from the Product General other than adding a filename to the Attribute ...

At some point it would be nice to write a specific Product Type for Downloads for the sake of managing when you see attributes, ie. radio buttons, vs just the text to them and make them easily seen but not look selectable ...

This, however, might be better managed in the attributes themselves ...

Music has a lot more fields and tables than a Product General ... so it definitely is its own Product Type ...

Product Free Shipping was made to show how an identical copy of Product General can function with permanent changes to the default data entry and catalog display ... how ever it uses the identical tables and fields ...

Thanks for the suggestion ...