Digital Port Selection � This field allows you to set up the input and output digital ports for either ADAT Optical or S/PDIF operation. The default setting is �adat� for both the input and output, and all of these channels will appear in the mixer and output pages of the Control Panel. NOTE: We recommend that you close your audio or music application before attempting to make any changes to the Digital Port Selection. The selections made here allow you to customize the FireWire 1814 for your particular studio setup. Changing from �adat� to �spdif� operation for your optical port will eliminate the �adat� channels�the �adat� input channels will disappear from the mixer page�s input section, and the �adat� output levels will disappear from the mixer page�s sw rtn section and also the output page. A/B Switch Function � This field allows you to change the assignment of the front panel A/B momentary switch, toggling between the �direct monitoring� setting, which is the default, or the �headphone out 1 A/B� setting. When �direct monitoring� is selected, the front panel A/B switch will enable and disable direct monitoring, which essentially unmutes (enables) or mutes (disables) the input channels in the Control Panel�s mixer. When �headphone out 1 A/B� is selected, the front panel A/B switch will toggle headphone output 1 between two monitoring sources (See �Using The A/B Selector� for more information.) �Set Source� Button for HP (Headphone) Source � Clicking the �Set� button brings up a �Headphone Out 1 A/B Set Source� pop-up window that will allow you to choose the A/B source selections for the front panel A/B switch, in effect, when the �headphone out 1 A/B� radio button is selected. You can choose between three radio buttons in row �A,� and between the three radio buttons in row �B.� You have to click on �set� to make the changes become active or �cancel� to disregard the changes. The front panel A/B Status LED will indicate the current source selection, where A = LED off, and B = LED on.
