I/O cards for ANALOG INPUT BOX ANALOG OUTPUT BOX MIC/LINE INPUT CARD LMY2-ML AD CARD LMY4-AD DA CARD LMY4-DA hank you for choosing the Yamaha input card for the analog input box AI8, and the Yamaha output card for the analog T output box AO8. Be sure to ask an authorized Yamaha service engineer to install the cards. Do not install the cards yourself. The connecting screw also functions as the ground. Secure the screw tightly.