I'm using a dual supply configuration. Where should the ground of audio signal be connected? GND or COM Pin?
For a dual supply configuration, the system ground is connected to the COM pin and the negative rail is connected to the GND pin. If your audio signal is referenced to system ground, then you should connect the audio signal between the IN and COM pins. If your audio signal is referenced to the negative rail, then you should connect the audio signal between the IN and GND pins.
