Cross-platform Audio Creation Tool:
Cross-platform Audio Creation Tool (XACT) is an audio programming library and engine released by Microsoft as part of the DirectX SDK. It is a high-level audio library for authoring/playing audio that is written to use "Xaudio" on the "Xbox", DirectSound on Windows XP, and the new audio stack on Windows Vista and Windows 7. Xaudio is an Xbox-only API designed for optimal digital signal processing.
en.wikipedia.org
XACT:
XACT（跨平台音效製作工具，Cross-platform Audio Creation Tool）是微軟所提供的音效程式API，為DirectX 10的部份功能。
zh.wikipedia.org
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Cross-platform Audio Creation ToolXACT