Roger,

 

The Swap sample simply swaps the left and right channels in the LFX. It the GFX it swaps the left and right channels and attenuates the volume. You'll find this code is Swap.cpp.

 

The property page appears as a tab on the speaker properties. Go the Sound Control Panel, click on the Playback tab and double-click on the Speakers endpoint. If everything is installed properly, you should see your System Effects tab.

 

Even if you see the property page, chances are your Swap APO is not loaded. This is because Vista will not load an "unsigned" APO. You can overcome this restriction by adding the following key to the registry:

 

 

As for the name of the device "CMedia with Swap APO", this is what ever you define it to be in the INF file. (This INF file is actually installing the audio driver with the APO. It is not just attaching the APO to the existing driver.)

 

Leonard

 

-------- Original Message --------
Subject: [wdmaudiodev] Re: Installing sample APO driver
From: Roger <roger_butler@xxxxxxxxxxxx>
Date: Wed, September 13, 2006 1:04 am
To: wdmaudiodev@xxxxxxxxxxxxx

Thank you. That was exactly what was required. I found the right device in one
of the drop-down lists on a driver properties pane.

So, what does the Swap APO example do? I noticed that the device has changed
from the generic "Microsoft HD Audio Driver" or similar to a "CMedia with Swap
APO". But I can't find a property page that implements the PropPageExt.dll. How
is the property pane invoked? And what does the sample do?

Thanks,
Roger.

--- Leonard Shoell <lshoell@xxxxxxxxxxxxxxxxx> wrote:

> I install the sample by going to the device manager, right-clicking on the
> audio device, selecting "Update Driver" then selecting the options that
> allow you to point the directory that has the INF and DLL files.
>
> Make sure you first change the "VEN_434D&DEV_4980" in the following line in
> the INF to the audio device in your system.
>
> %HdAudioFunctionDriver.CMedia9880.DeviceDesc%=HDAudio.SysFx,HDAUDIO\FUNC_01&
> VEN_434D&DEV_4980
>
> Leonard




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