16Mute functionFade Down/Fade Up functionInput source selection 1 through 5Phase switchFunction switchDisplay/POWER switch.The following describes these functions.Volume Up and DownThese two buttons are programmed with variable speed volume change profiles. The rate ofvolume change will be slow upon initial pressing of the Volume Up or Down buttons. Holding thebutton depressed will cause the rate of change to accelerate, allowing for more flexible controlwhen large changes in volume are required.MutePressing this button will cause the MUTE function in the VK-20 to toggle between ON and OFFstates. The Mute LED on the VK-20 front panel will reflect the status of the Mute circuit.FadePressing the FADE button on the VK-R3 remote control will cause the volume to smoothly decayover the period of several seconds. This allows for a gradual reduction in volume, as opposed tothe instantaneous MUTE function. This can be particularly useful during the presentation ordemonstration of your equipment. When the FADE button is pressed, the volume will go down allthe way to zero (000 on display, unit in Mute).Pressing the Fade button again will cause the volume to ramp back up to its initial value.INPUT SELECT:Pressing any input selection button on the VK-R3 remote control will switch the VK-20 to thatinput. All of the set parameters associated with that input will be loaded at this point.DISPLAY/POWER switch.