USB Audio Devices Rev. 3.0 and Adopters Agreement

The Audio Device Class Definition applies to all devices or functions embedded in composite devices that are used to manipulate audio, voice, and sound-related functionality. This includes both audio data (analog and digital) and the functionality that is used to directly control the audio environment, such as Volume and Tone Control. The Audio Device Class does not include functionality to operate transport mechanisms that are related to the reproduction of audio data, such as tape transport mechanisms or CD-ROM drive control. The AV Device Class does not include functionality to operate transport mechanisms that are related to the reproduction of AV data, such as tape transport mechanisms or CD-ROM drive control. Handling of MIDI data streams over the USB is directly related to audio but will not be covered in this version of the specification. Future versions may include support for MIDI.