I use SMS Audio Headphones on my iPhone 6. These phones are bass heavy and I want to custom equalize my music to turn down the bass and turn up the treble. Spotify is great for this. I want to be able to customize the EQ for the iPhone Music app for the new Apple Music. Setting the eq on itunes before importing is not an option for streaming Apple Music. Are there any apps that allow you to customize eq from what's coming out of the Music app? A free one would be preferable, but please list all the ones you know.