Best EQ on the market

The developers have a massive list of headphones (mine are supported even though they are limited to sale in Canada only) and this app makes them sound better than ever before.

edit: The app keeps crashing on my iPhone 5. If the app gets to a point where I can actually listen to my non-drm iTunes music then I will change my rating to 5 stars again.

DaneClark about Accudio™ Pro, v1.1.1