Phonon

While Phonon is mostly developed with software developers in mind, and the design is centered around ease of development, but Phonon also provides several features and benefits for the end user.

Features

• Centralized configuration of audio and video: Configuration of hardware and media frameworks are offered in a single, centralized dialogue, so that applications don't have to reimplement specialized configuration dialogs.
• Purpose driven design: Instead of demanding that you select special audio outputs for special applications, Phonon applications describe what kind of sound output they make (Notifications, Music, Video, Communication), and lets you select outputs for these categories individually.
• Automated device selection: The use of pluggable audio and video devices like USB or Bluetooth headsets is almost ubiquitous today. Phonon acts on information and signals from Solid, which is KDE's hardware subsystem, and automatically makes use of new devices.