OUTPUT A male XLR provides a balanced low impedance signal for connection to balanced, low-Z equipment (mixing console, workstation, etc.) PAD Most instruments will operate properly when set to the "0" position. Set to the "-20dB" position for use with very "hot" instrument signals. Set to "-40" when connecting to the speaker output of an amplifier. GND/LIFT Disconnects the ground between the input and the XLR output when set to the LIFT position to help eliminate hum.