- For Balanced, Low Impedance Microphones. - High Cut Fileters for tone control, 330 Hz, 6 dB/octave. - Phantom Power, +22V DC for condenser-type microphones. Activate by default, cut Jumper J1 to disable. - Voice Gate Function, module OFF until input signal exceeds threshold. - Sensitivity Control - turn clockwise to increase sensitivity (to open gate with lower input signal) and counter-clockwise to reduce sensitivity (to open gate with higher input signal) - Connector: removable terminal block.