Custom Audio Effects in Windows Vista

Updated: May 12, 2006
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Custom Audio Effects in Windows Vista

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Updated: May 12, 2006
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Microsoft Windows Vista allows third-party audio hardware manufacturers to include custom host-based digital signal processing effects as part of their audio driver's value-added features. These effects are packaged as user-mode System Effect Audio Processing Objects (sAPOs).

This white paper provides guidelines for device driver developers who want to create and install custom sAPOs.

This information applies for the Windows Vista operating system.

This paper includes:

Windows Vista Audio Architecture

How to Install sAPOs

Run-Time Behavior of sAPOs

Application Control over sAPOs

How to Implement a Custom sAPO

How to Implement a UI for Configuring the Effects


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