Viewsonic VG900 ユーザーズマニュアル

 displays the timing mode (video signal input) 

coming from the graphics card in your computer. See your 
graphic card’s user guide for instructions on changing the 
resolution and refresh rate (vertical frequency).

VESA 1280 x 1024 @ 60 Hz (recommended) means that the 
resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

increases the volume, decreases the volume, and mutes 

the audio.

 temporarily silences audio output.

The Manual Image Adjust controls are explained below:

 (Horizontal Size) adjusts the width of the screen image. 

Vertical size is automatic with your LCD display.

   VG900_VG900b