Combo XLR14' jack inputsconnect a microphone or instrument cable Backlit controls: MiniFuses knobs light up in response to r input, turning red when the signal is too high Gain control: Adjust the level of r connected mic or instrument Instrument level switch: Switch between line and instrument levels for clear, consistent signal Monitor level control: Adjust the main output volume for r connected speakers Arturia MiniFuse 1 USB Audio Interface, White