To use this audio interface, first connect your audio sources to the XLR - out ports. Since it doesn't have a power supply, you'll need to use an appropriate external power source. When connecting, make sure the cables are firmly plugged in to avoid audio issues. As for maintenance, keep it in a clean and dry place. Regularly check the connections for any signs of wear. Also, be gentle when handling the unit to prevent internal damage. Don't expose it to extreme temperatures or humidity, as this can affect its performance.