This Studer card, part number A949.0427, offers four analog microphone/line inputs, ideal for your audio needs.

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 securely in place, you can connect your microphones or line - level devices to the four available inputs. When powering on the system, the card should start working right away. For best results, keep the card in a clean and dry environment. Avoid exposing it to extreme temperatures or humidity. If you need to clean the card, use a soft, dry cloth. Don't use any harsh chemicals or abrasive materials, as this could damage the card.