Sorry I\'m hitting on this quickly... I go through the motions w/o really paying attention to what I\'m doing on the PS2, but you should get the idea...
Press your Select button on the gamepad.
Now with all those options/icons displayed, highlight the one that is related to SETUP menu.
Now press the RIGHT D-PAD until you highlight AUDIO SETUP.
Now Highlight the AUDIO DIGITAL OUT feature, press the RIGHT D-PAD to Highlight DIGITAL OUT(OPTICAL) and turn it OFF.
Now press the LEFT D-PAD until you have Highlighted the AUDIO DIGITAL OUT again.
Now press the DOWN D-PAD until DVD VOLUME is Highlighted. Press the RIGHT D-PAD and select the
+2 and you will be all set.
Get out of the options/icon features by pressing SELECT again a few times and you\'ll find your volume to be much improved.
For whatever reason, I\'ve found I have to do this every once in awhile. Isn\'t always due to unplugging unit from wall either. Regardless, these are the procedures that\'ll have you listening to movies much better on your PS2. Too bad Sony hosed up on this particular thing. Kinda sucks that you gotta go around your elbow to get to your thumb just to listen to a DVD movie...