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Introduction to WDM Audio Drivers - Windows drivers ...

https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/introduction-to-wdm-audio-drivers

A filter driver resides in a WDM driver stack and can intercept and modify the I/O request packets (IRPs) that propagate through the stack. Upper- and lower-level filter drivers reside above and below the function driver, respectively. In this section, the term filter refers to a KS filter rather than a filter driver unless noted otherwise.

Filter Factories - Windows drivers | Microsoft Docs

https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/filter-factories

The WDM audio system represents the device as a filter and represents the audio jacks as pins on that filter. The filter for an audio device is implemented as separate port and miniport drivers that are bound together to act in unison: The miniport driver contains the hardware-specific code.

sysaudio.sys Windows process - What is it?

https://www.file.net/process/sysaudio.sys.html

The process known as System Audio WDM Filter belongs to software Microsoft Kernel System Audio Device or Microsoft Windows Operating System by Microsoft (www.microsoft.com). Description: The original sysaudio.sys is an important part of Windows and rarely causes problems. Sysaudio.sys is located in the C:\Windows\System32\drivers folder.

How to use the WDM Streaming System Devices Filters?

https://social.msdn.microsoft.com/Forums/expression/en-US/e07bc98e-cc9a-4b8f-8d9c-eb9d7836f070/how-to-use-the-wdm-streaming-system-devices-filters

So far I have only found filters with an Output Pin, "Capture", with no reference to front or back. However I found a filter called "Realtek HD Audio Output" within the "WDM Streaming System Devices" section, which has all the desired pins (Front Green In, Rear Blue In and so on) and confusingly some extras (Input7, PC Speaker, among others).

Using Windows WDM System Audio with Apollo (Thunderbolt ...

https://help.uaudio.com/hc/en-us/articles/214494346-Using-Windows-WDM-System-Audio-with-Apollo-Thunderbolt-

Using Windows WDM System Audio with Apollo (Thunderbolt) Windows WDM system audio is typically used for audio I/O in media players, web browsers, and similar programs, while ASIO is typically used for audio I/O in DAW programs. WDM and ASIO are different subsystems that are configured separately. To ensure proper audio system functionality, follow …

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