I can't remember what the amaon plugin does in the code, but I know it had some logic in there, i thought to make audio versions a lower priority in the set of results.
Speaking for my own metadata sources which I do know for sure. The Goodreads plugin will try to ignore any of the audio variants, unless audio is the only version Goodreads returned in the search. Hopefully that situation is rare anyway, but I thought it might be better due to the inconsistent way Goodreads aggregates it's results.
The B&N plugin will completely ignore audio versions. It doesn't aggregate editions in the search results like the Goodreads website does, so you should be able to rely on getting a non audio format in the results.
WebScription and Fantastic Fiction do not have audio editions in the search results on the website.
Of course if you have given a book an isbn that refers to an audio version, then you will still get that audio version metadata back. The above only applies when the metadata source plugin is doing a title author search due to no isbn being present or the isbn not found on the website.
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