Tim, sorry i misunderstood your current approach now, so you have ditched the LFX/GFX approach and have not gone to a DMO approach for you client or is it the other way around. --- On Thu, 9/4/08, Tim Roberts <timr@xxxxxxxxx> wrote: From: Tim Roberts <timr@xxxxxxxxx> Subject: [wdmaudiodev] Re: GFX/LFX fullduplex support. To: wdmaudiodev@xxxxxxxxxxxxx Date: Thursday, September 4, 2008, 3:38 PM pete c wrote: if i ditch the lfx/gfx approach and rely on the DMO approach, can you inplement your own AEC at that level and can it be applied as a global system wide effect or does the audio application that would utilize AEC now have to specifically call into this DMO layer to take advantage of this custom AEC functionality. Each audio application has to add the DMO to their audio graph. It is Microsoft's current philosophy that each application should be in complete control of its audio path, so an app should not pay the penalty for AEC processing unless it specifically wants it. I'm not saying I agree with that philosophy, and indeed I am working with one client to do exactly what you describe, but that's what the Microsoft audio team currently espouses. -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc.