Studer's part number is A949.0427. It offers four high - quality analog microphone/line inputs, perfect for various audio setups.

To use this Studer mic/line in card, first make sure your D21m Modular I/O System is powered off. Then, carefully insert the card into the appropriate slot. Once it's in place, power on the system. When connecting your microphones or audio sources, double - check the input levels to avoid distortion. As for maintenance, keep the card in a clean and dry environment. Periodically, use compressed air to blow out any dust that might have accumulated. Also, be gentle when handling the card to prevent any physical damage. If you encounter any issues, refer to the system's manual or contact Studer support.