2Mau1wurf1977 Of course it must be issue in this case. I said about different brands firstly. And the goal of topic starter is two wt connectors, non opl. Even if fm at the sound card is impossible to disable or switch to another address usually two boards from different manufacturers don't conflict by 388h and live nice both together. I can not say same about two cards from one manufacturer. Two WT connectors on two different boards may be on two addresses, e.g. 300 and 320. I see not any problem here.