Sonos has updated the iOS controller apps for its wireless music system adding high resolution graphics for Retina Display devices and improved volume controls. The free Sonos Controller app, available in separate iPhone and iPad versions, allows users of Sonos wireless music systems to use their iOS devices to remotely control playback of content from iTunes, NAS devices and a variety of online music and radio streaming services. Users can search for songs and control the music selection and volume in each room individually, configure alarms and sleep timers and playback music from Airplay sources. In addition to Retina Display graphics, the latest update also adds support for using the hardware volume buttons on an iPhone, iPod touch or iPad running iOS 4.3 or later to control the Sonos playback volume. Sonos Controller for iPhone and iPod touch and Sonos Controller for iPad are available separately from the App Store as free downloads.