58Chapter 10 Switcher and OverlaysSwitcher Group OverlaysFIGURE 55The bottom band of the Live Desktop, below the monitoring section, is host to the Switcher and relatedcontrols and features, including the Overlay Controls (Figure 55).Section 10.1 SwitcherSwitcher Buttons Transition ModeFIGURE 56AV-HLC100 uses a quick and convenient single-row Switcher (Figure 56) to accomplish operations thatwould otherwise take at least two steps using the Control Surface.Thus a single click on a Switcher button thus does several things as follows:• The clicked source is assigned to AV-HLC100’s internal ‘Preview’ row (associated audio sourcesmay also be affected by Switcher activity – see Section 13.8.4).• AV-HLC100 performs a transition to display the designated (Preview) source by applyingtransition defined by the Transition Mode settings at right.10.1.1 AUX Video OutputThe Switcher row can also be used to determine what video source is sent to the AUX video bus (carriedby the SDI 2 and the AUX NDI outputs).As noted in Section 8.3.2, the default source can be either Program or (clean)Preview. However, byholding down ALT on the keyboard while punching a Switcher row button, any Switcher source can besent to AUX instead. An AUX tag is added to the Switcher display to identify the selected source. Torevert to the default AUX source, roll the mouse over this tag and click the (x) gadget that it shows.