This function defines two central user buttons to switch selected input channels between their A and B sources. You will need one button to switch the selected range to input A; another to switch to input B. Up to four channel ranges can be defined.

Note that the status LED of the "All B" button only lights if all channels can be switched to the B input. If switching is not possible across all channels, then the "All B" button does not light. This can occur if one or more of the B inputs are not assigned in the Signal List display. In this instance, only the channels with a B input assigned, are switched.