Microsoft recommends that hardware vendors use the USBAudio driver for their USB Audio devices instead of writing proprietary adapter drivers. This means that a device that complies with the USB audio specifications requires no proprietary adapter driver. USBAudio drives the device directly, without the aid of a proprietary adapter driver. When an audio device identifies itself as USB Audio-compliant during Plug and Play device enumeration, the system automatically loads the USBAudio driver to drive the device. Support for MIDI devices was added in Windows Me. In Windows 98 Usbaudio.sys introduced support for USB devices such as speakers and microphones. For more information, see Kernel-Mode WDM Audio Components. In addition to Usbaudio.sys, there are several other kernel-mode audio components in the Windows Driver Model (WDM). Usbaudio.sys supports a subset of the features that are described in the USB Audio specification. The USB Device Class Definition for Audio Devices specification (release 1.0) is available at the USB Implementers Forum website. The USB Audio class system driver (Usbaudio.sys) is an AVStream minidriver that provides driver support for audio devices that comply with the Universal Serial Bus (USB) Device Class Definition for Audio Devices.
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