How to access hidden volume in Technics DVD-A10?

How do you access the hidden volume control in
the Technics DVD A-10 DVD player? I want to hook
the player directly into my Audio Research amplifier.
If you read through the 100 page instruction book you will find the set of remote controlled menus taht control the various adjustments the A10 can do. I am at work so I cannot tell you key by keystroke what to do. But if no-one else does by the time I get home this evening, I will post the instructions.
I am original owner of an A-10

On the remote, push display twice..toggle left. Toggle up or down to control volume.

Thank's sogoo51!