RGBLink VSP 729 - Manual (Page 43)

4.Menu Orientation
PROG
VSP 729 User Manual 43
PROG
Select channel,Pressping this button to program the input source，
HDMI、DVI、VGA、YPbPr，CVBS1，CVBS2，CH1，CH2，CH3，
CH4(matrix) .
Pressping the Preview，and Pressping PROG，rotate the knob switch to
show tree diagram on the LCD.User can select by need to.Preview5 in to
set background，User can select Black or VINO.