Studer Part Number: A949.0427. It offers four high - performance analog microphone/line inputs, ideal for various audio setups.

To use this Studer card, first, make sure your D21m Modular I/O System is powered off. Then, carefully insert the card into the appropriate slot. Connect your microphones or line - level audio sources to the four analog inputs. Power on the system and adjust the audio settings as needed. When handling the card, avoid touching the electronic components with bare hands to prevent static damage. For maintenance, keep the card in a clean and dry environment. If you notice any performance issues, power off the system and check the connections. Also, it's a good idea to have it inspected by a professional periodically.