Hello, Steve! Generally saying, your design must be improved. The problem appears in DShow, because default Clock for the Capture Graph is from the AudioRenderer. Many capturing applications are building their own Capturing graph (like Microsoft MovieMaker or Sonic DVDIt!) and they do more sophisticated Clock control. Without going too deep into details, you may fix that problem in a two ways: 1) (complicated) add a Clock to your WDM, usually Filter Graph Manager prefers Source Clock to AudioRenderer Clock. 2) (simple) set periodically fake breaks in your stream -- i.e. set Time Discontinuity Flag "on" every 5-9 minutes. This will force Filter Graph manager to keep better sync between all streams. Nick Gorokhov Audio/Video Engineer Sonic Solutions, Inc. ____________________________________________________ Sell on Yahoo! Auctions ? no fees. Bid on great items. http://auctions.yahoo.com/ ****************** 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/