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Pick the Channel you would like to change the input and hold down the A/B button or "OverPress" it till it lights up RED
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The Input channel of the slider will appear in the Wheatstone Interface software as the selected tab. In our example Input 12.
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Look at the LED name of the channel you would like to change and you will see the input change as you twist the knob
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Now if you look at the input you will see the new source
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how to change slider to be for a different source;
also explain A/B switch