Hi,
In the current version of the plugin there are two ways to do it:
– Assigns to the product, as the audio file for selling, a zipped file with both audio files, and a mp3 file for demo.
– Another solution, but with the pro version of the plugin, is creating a different product for each song format, one for the mp3 and another for the ogg, but untick the option: “sell as a single” in these products, and then for each pair of song products, creates a collection. The collections have assigned a price for selling. And finally, uses in the store’s shortcode the attribute: load=”collections”, for example: [music_store load=”collections”]. With this attribute in the shortcode the store will display only the collections and not the single songs.
Best regards.