A simple example of using a control as an IFB source pre-selector
This example is how to pre-select and audio source to a port output, then using the IFB function the source is dimmed or cut when a panel talks to the port output. In this example the Audio panel has a key to pre select a programme input to the studio floor loudspeaker output (LSTB). When the Audio panel talks to the LSTB the selected Prog feed is dimmed by 6dB.
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