In one of mine, by pressing zone 3 and holding it for a couple seconds, it would switch it between a secondary input. You could have sound from one input playing on zones 1 and 2 but something different on zone 3. It also locked the volume on Zone 3.
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2011 Rockwood Mini Lite 1809S
2013 Rockwood Ultra Lite 2304S
2004 Dodge Dakota SLT+ 4.7
2012 Ford F150 FX4 3.5 EcoBoost
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