Use these three buttons to select the "Active Group". All other commands, (including monitoring and scanning), apply only to the Active Group. How is it used?
These two buttons pop up the source selection menus for each Group. The default source for Group 1 is TC1 (Tape Console 1) and the default source for Group 2 is TC2 (Tape Console 2). The current source selection is indicated by the button text. How is it used?