74You may choose to think of these audio sources as being associated with the same-numbered videoinputs in the nearby rows on the rear connector panel. This notional linkage is not strictly enforced,however.You can connect directly to any external audio source in the Advanced Configuration panel. Also, forreasons of your own, you may well prefer to treat various audio sources as independent of the nominallyassociated video input.13.4.1 Connection TypeNaturally, only one connection can be active for a given audio input at any moment. To access theConnection menu, move the cursor into the label of an input, and click the Configure (gear) button thatappears just at right. The Advanced Audio Configuration panel will be shown. The drop-down Connectionmenu at the top of this pane allows the selection of one of the supported sources.• By default, local physical sources are listed as Input 1, 2, and so on• Follow Video Source – the default selection, follows the same numbered Switcher video input• All available NDI (network) audio sources13.4.2 Analog Audio InputFor most Inputs 1-8, the connection type control at right defaults to either Auto-Detect (or Embedded inVideo), providing automatic detection of sound from HDMI, SDI and NDI video sources. To connect tothe analog audio input connectors, instead, select Input 2 and then choose the Line option from this menu.Section 13.5 Skype TX and Mix MinusThe default Connection option for external Audio Mixer inputs is Follow Video Source. When one of AV-HLC100’s video inputs is assigned to the Skype TX Caller source, the audio control group is thusautomatically assigned to govern incoming audio from that remote Skype caller by default.Note: It is not necessary to configure a special audio ‘mix minus’ to serve as the return sound for theremote Skype caller. AV-HLC100 handles this automatically, ensuring that (except when the TalkBackfeature is engaged) the remote caller receives a special mix comprised of the Master mix with theremote caller’s sound removed.Section 13.6 TalkBackThe Audio Mixer input labeled TALKBACK serves a special purpose, providing a way to converse withremote Skype TX Callers off-air (i.e., without intruding into your live program). You can choose whataudio source to supply for TalkBack purposes from a variety of input types, as discussed in the previoussections.As mentioned earlier, the default Connection option for an external Audio Mixer input assigned to a SkypeTX channel allows the corresponding controls to govern audio from the remote Skype caller. In this case(that is, when an audio control is ‘listening’ to a Skype TX channel), a new button labeled TALK is addedbeside the group’s SOLO button.