Auxiliary Audio Interface
[The feature associated with this page, Waveform Audio, is a legacy feature. It has been superseded by WASAPI and Audio Graphs. WASAPI and Audio Graphs have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use WASAPI and Audio Graphs instead of Waveform Audio, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Auxiliary audio devices are audio devices whose output is mixed with the MIDI and waveform-audio output devices in a multimedia computer. An example of an auxiliary audio device is the CD audio output from a CD-ROM drive.