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X treme 2018 mic

What does vr1 do ? Its the third potentiometer on the front side of the circuit board where the board itself has to be removed from the mic to get to vr1 what is it ?
Hmmm I've never had one completely apart so didn't know there was a pot on the other side. Can you follow the traces to see whether they go? Maybe a gain for the element, just a wild guess.
 

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