[wdmaudiodev] Multiple APOs in Vista?

  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Wed, 4 Oct 2006 09:15:26 -0700

Hi everyone,

In the APO documentation "Custom Audio Effects in Windows Vista", there
is a discussion about how to install multiple APOs for a particular
endpoint. This is done by adding additional FX keys, under FX\1, FX\2,
and so on. (This is on page 10 in the doc.)

However, in the later document "Reusing Windows Vista Audio System
Effects", it implies that an sAPO must implement the original MS APO
audio effects (Virtual Surround, Speaker fill, etc.). The suggested
method for this is to wrap the original MS APO into your own APO,
passing the audio to it as appropriate.

This seems to be at odds with the original document. Instead of wrapping
the APO, why can't a second APO just be added in the FX\1 registry key?
In that case, you can just leave the MS APO at FX\0 and still fulfill
the requirements that the original APO functionality is provided.

Is this an acceptable solution? Or are multiple APOs no longer allowed
to be installed for a particular endpoint?

Thanks for any info,

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