Dave or Debby wrote:
It is the Noise Blanker (gets rid of electrical noises from power
wires and the air. There ain't no mystery to this!

An extension cord adaptor can be made to convert your 4 pin to the 5
pin din. Dynamic is a MIC GAIN--leave all the way up.
Dave!

Leaving it all the way up (mic gain) can cause it to sound like ****, and
make it pick up way too much background noise. Try to keep it as low
as you can, test it with a friend a few miles away from you.