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I embarked on the research a bit already and found my best resource to be the spec sheet on the api512c.  It gives a layout and description of all the pins in the socket. Of course this is for the api512c and I have an OSA MP-1c, but if they are universally interchangeable it should be the same layout... right? The diagram doesn't totally make sense to me. The power stuff (pin 12, 13, 14) is pretty obvious. Remaining mysteries.
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I think the pinout for the 525 is a little clearer.
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Pin 1: Chassie of module?
Pin 2: + audio out (+4 db) ?
Pin 3: + audio out (-2 db) ?
*so I'm guessing I pick weather I want to run at +4 db and -2 db And wire my + XLR in pin to that? (assuming I don't install a switch)
Pin 4: "Out put Low"? What is that? Is that my out - ?
or is...
Pin 5: "Audio Ground" My out - ?
Or do the In and the out share pin 5 Audio Ground for their - ?
This is where it all gets lost on me. Can anyone just explain Where my +, -, and GND for my XLR in and XLR out go?
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+4 = pin 2, low = pin 3, ground = pin 1 of the XLR
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Finally. I understand I'll need a separate power supply for the +48v (pin 15) Where does my - for that power supply go? PWR GND (pin 13) with the main power?
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Yes.