Tim, >>My client owns the microphone hardware, and it uses an XP-style driver, so we >>have a >>standard WDM filter driver on the microphone end, and an LFX APO on >>the speaker end. So for your Vista implementation you were able to use a LFX APO for the render side that feeds render data to the AEC which lives in the WDM filter driver on capture side. Did you have a problems with render/capture synchronization as we've been discusing with the GFX/LFX approach? Did you make any attempts to pursue a GFX/LFX framework for AEC as we've been discussing? thanks. --- 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, 3:50 PM pete c wrote: 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. My client owns the microphone hardware, and it uses an XP-style driver, so we have a standard WDM filter driver on the microphone end, and an LFX APO on the speaker end. For pre-Vista systems, we use a filter driver on both ends. -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc.