DirectX Audio is a blanket term that refers toDirectSound andDirectSound3D, which are included in theDirectX bundle of application programming interfaces (APIs).
OtherDirectX related glossary:
DirectDraw
Direct2D
Direct3D
DXGI
DirectInput
DirectPlay
DirectPlay Voice
DirectSound
DirectSound3D
DirectMusic
DirectX Audio
DirectX Media
DxDiag
DirectX Media Objects
DirectSetup
XAudio2
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