A shorted cable like sound

[RHarris]

I'm getting loud shorted cable kind of sound at times while playing. Checked cable its ok even changed it. Took jack out of guitar and checked it it seems ok. I noticed it is a TRS type configuration oh yea this is a true anthem mic system.
is there a wiring schematic for this would like to know how it is meant to function in controlling the blend of pickup and mic.

[Caleb_Elling]

Hey RHarris,
I don't have a wiring schematic that I'm able to send out, but I'll definitely try to help you figure this out.

Have you checked the 1/8" female connection on the preamp? That's where the TRS 1/8" male plug connects to the preamp. If that connection is intermittent, it can cause some pretty crazy noises.