Leviton has developed a stand-alone iOS app for controlling the Hi-Fi 2 4x4 distributed audio system from an iPhone, iPad, or iPod Touch. Compatible distributed audio systems include the Hi-Fi 2 4x4 (Four Zone, Four Source) and the Hi-Fi 2 8x8 (Eight Zone, Eight Source, expandable to 16 Zone, 8 Source). The app replicates the familiar Volume Source Control, the Hi-Fi 2's in-wall control, and uses the same multi-push functionality for advanced audio settings.