When using an SO-AES4 digital output card within a V-Mixing System, set its clock to SRC. Then set the sample frequency to match what your console is set to in the System menu (48kHz or 41kHz). Alternatively you can use an External Clock source from a digital signal processor or other appropriate device. Do not use the INT setting on the card as this will make the S-4000S internal clock conflict with the M-400 Master clock resulting in garbage sound.