Multifunction knob 
 
 
⚫  Non-menu Operation: 
In non-menu-operation mode, rotate this knob to adjust the brightness of 
waveform display. The settable screen brightness ranges from 1% to 100%. 
Turn it clockwise to increase the brightness, and turn it counterclockwise to 
decrease the brightness. Press Display → Intensity to adjust the waveform 
brightness. You can also use the knob to adjust it. 
 
⚫  Menu Operation: 
When you operate on the menu, the backlight of the knob is illuminated. For the 
menu item that has multiple parameters under it, when you press the menu 
softkey, rotate the knob to select the parameter item, then press down the knob 
to select it (sometimes, the specified parameter item can be selected by rotating 
the knob). The knob can also be used to modify parameters, input the filename, 
etc.