I am trying to do the reading on the Vista audio architecture, and I have a terminology question. I have seen numerous references saying that APOs are the right way to handle custom processing that might have been implemented as a filter driver in previous releases. But the only white papers I can find describe writing "sAPOs" - System-Effect Audio Processing Objects. Are APO and sAPO just two names for the same thing, or is an sAPO a specialization of some more general APO concept that I cannot find? Is the audio\sysfx\apo sample in the DDK the right place to start? I found one reference to an APO SDK being available in the Platform SDK. Is that still the plan, or should I stay with the DDK/WDK? -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc. ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/