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Shure SM82 - anyone know how to use this thing?

A local pawn shop had a couple of these mics and after doing a little research on them decided to pick one up for the relative bargain price they're selling them at. The mic is an odd one...a broadcast mic with built in amplifier and limiter that puts out a line level signal. It is set up to use a battery (that's no longer available) or phantom power.

Need help inventing

Okay, so I'm not an electrical engineer. Listed below is an accurate accounting of my stupidity. Please help.

I am trying to create a line in/line out device with faders for the purpose of attenuation of an incoming signal. Kind of like a mixer, but without any extraneous stuff such as Pres, sends, returns, etc. Simply line in --> Attenuation --> Line out.