Balanced Class D Switch

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Sorry if this is in the wrong forum....

Need some confidence boosting, have attached a diagram showing how I intend to switch between an internal DAC UnBalanced source and an auxillary Balanced source. I intend to buy a 4PDT switch as I will be switching two channels to two UcD modules, I presume and I can join both pin 1's from the XLR inputs prior to running them to star chassis ground? And then run another ground from the extra UcD module to the chassis ground and then double up the switch connections using a 4PDT switch.

A few questions -- do I have the diagram correct!??

I'm also implementing a 10K pot after the switch, which is going to really confuse me but I'm learning!
 

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