More on the Oppo's stereo only output, are you getting the siganl from the FL and FR outputs on the back to the Lightspeed?
Also taken from the manual are you setup it the programing for this way.
"4. Output Volume: Allows you to enable or disable the analog volume controls (also known as Variable
Audio). The available options are:
�� Variable – Enables the analog volume control. Use the VOL+/- buttons on the remote to
increase/decrease the analog audio output level (the maximum is 100).
�� Fixed – Disables the analog volume control. The VOL+/- buttons on the remote will no
longer affect the analog audio output, and the volume level is fixed to 100."
And then this also
"For the stereo outputs, if the audio system you are connecting to does not have surround speakers,
set the Down Mix option in the Setup Menu to Stereo. If the audio system has surround speakers
and Dolby Pro Logic or other surround audio decoding capabilities, set the down mix mode to “LT/RT”.
(For more information, refer to “Down Mix Mode” on page 68)."
Cheers George