IBM 6517-6LN - Manual (Page 23)

A20
Main Menu Description
On Screen Display(OSD) Selection and Adjustment
VOLUME
ON
70
Raises or lowers audio level.
VOLUME
TREBLE
BASS
BALANCE
MICROPHONE
Raises or lowers treble level.
Raises or lowers bass level.
Changes levels of left/right speaker.
Enables or disables microphone usage.
: Adjustable