OBERHEIM SYNTH

Please take a look:
http://members.aon.at/gdaniel1/

Within the red frame there are 2 misterious PAGE 2 -knobs. 
-
1. "O....O MOD INVERT" 
2. "PW" (labeled F-ENV in Page 1)

So far my manual tells nothing about it.
Has anyone an Idea about the missing letters or how these 2 functions 
work and/or has anyone perhaps a link or a pdf of the SECOND EDITION 
MANUAL without these cut edge?

At least below the SYNC- Button I assume " SOFTWARE REV.NO. - WHILE 
HOLDING LIT CHORD BUTTON ".

I werse same interested in as absolutely thankful for a clarification.

Gerry