75FIGURE 78When the TALK button is lit, audio you supply via the TALKBACK input (perhaps sound from the 1/8”motherboard audio input) is sent to the remote caller, temporarily replacing the normal mix-minus soundthat remote caller would otherwise hear. At the same time, AV-HLC100 sends the incoming sound fromthe remote Skype caller to its Headphone output, enabling you to have a two way conversation off-air.Note: You’ll want to take steps (such as by enabling Mute, or perhaps Follow Program Video) to preventsound from the Skype caller being sent to your live audio mix during TalkBack conversations.Section 13.7 Common ControlsMany important features and optional settings are common to most source types, and some even appearfor outputs. Let’s review these before continuing.13.7.1 MuteMute switches for inputs and outputs appear as ‘speaker’ icons located just above in the main Mixerpanel. A single switch controls multiple channels, as appropriate for that source. Enabling Mute removesthe sound from that source from all downstream audio mixes and outputs.Hint: Muted sources still show signal activity on the VU meters, but levels are drawn in gray rather thanfull color. This is also true for sources with Follow set that are not currently audible on output.13.7.2 SoloSolo implementations and options vary widely in the audio industry, but broadly speaking, they provide severalvery useful functions. The Solo feature offers remarkable flexibility without overly confusing complexity.Consider a few basic design concepts: Enabling Solo for a source sends its (post-fader) sound to the Headphones output, and removesall other sources from that output. Solo has no impact on the Master audio mix.