I assume you mean you are running optical from the PS3 to the Outlaw (not oppo). If video is ahead of audio, that's not a problem you can fix with AV sync adjustment. AV sync allows audio to be delayed to compensate for video processing delays, fixing the condition of audio being ahead of video. Have you set the Model 990's AV sync to zero? The PS3 may be creating a delay in audio when re-encoding the original audio to DTS, which could be compounded by the AV sync delay in the 990.