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You can change the border thickness of Channels in the just:in user interface. This helps you to see the state of each Channel easily.

Audio Preview

You can listen to the Audio stream of the incoming Signal to preview the Audio part in addition to the Video preview. It is possible to listen to single tracks but also to turn all Audio Channels on/off with a single mouse click. This is for previewing only and will not replace a hardware device to check the audio quality or AV synchronisation.