This app is quite useless, since the volume adaption is not done to the single file itself, so it really would leave the treatment changed to an absolute volume of your choice and thus your treated files would appear in the same volume in any/every and not just in iTunes or other Apple-crap.

Maybe it works for iTunes, but this is useless as a priest.

This means, you are already cheated with the product description above. It is not what music enthusiasts need.