[wdmaudiodev] Re: Installing a GFX filter

From: "Matthew van Eerde" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "Matthew.van.Eerde" for DMARC)
To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
Date: Mon, 16 Jan 2017 01:25:15 +0000

WmaLfxGfxDsp.dll is the .dll that hosts the inbox System Effects Audio
Processing Objects. You can read about how SysFX APOs work here:

https://msdn.microsoft.com/windows/hardware/drivers/audio/system-effects-audio-processing-objects

These replace the concept of GFX filters (
https://msdn.microsoft.com/en-us/windows/hardware/drivers/audio/gfx-filters ;),
which were a thing in Windows XP but no longer work since kmixer.sys was
removed in Windows Vista.

From: Chris Perry<mailto:chperry1@xxxxxxxxxxx>
Sent: Sunday, January 15, 2017 11:48 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Installing a GFX filter

The latest Windows installations have a global effects filter
(WMALFXGFXDSP.dll).

Here is the driver stack for USB audio on my laptops.

[cid:image001.png@01D26F38.53555A40]

It appears that this has been around since October 2013

[cid:image003.jpg@01D26F3E.3DAED850]

I did a search on the Internet for what the purpose of this DLL is but came up
empty.

I have two questions.

1) What is the purpose of this DLL (possibly environmental audio for
gaming)?

2) If we develop a GFX filter will it install if there is already a GFX
filter?

Thanks,

ChrisP

References:
- [wdmaudiodev] Installing a GFX filter
  - From: Chris Perry

[wdmaudiodev] Re: Installing a GFX filter

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