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Now that you have the right drivers, open Realtek audio console and look for the mic entry.
You will be able to set amplify levels up to 30dB, doing so will solve your issue.
I posted this earlier...

Assuming you run Windows, did you install the correct drivers? I use MoKiChU's drivers from this board.
Open the Realtek audio console and look for the microphone entry. You can set the...