Designed specifically for the Audyssey Audio Dock, the Audyssey App gives the iPhone user the ability to customize their sound. The app also features a new way of adjusting bass and treble using Audyssey Tilt, Fast Slope tone controls and a selection of Audyssey's Dynamic Volume presets, including "Background Listening." And with a full-screen graphical editor for creating custom EQ curves, you can tailor the sound as much as you like.