Modify a Little Bear mc103 pro xlr switcher

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I have seen where someone has added a 12v relay for switching to the mc103, but I would like to put a module in that automatically switches to the active source. I know my Fosi v3 monoblocks have that feature built in and I think it would be nice to integrate jnto mine.

What do they call a board that does this, and what do I need to look for in one when I find one?
 
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