I have a shure CVC-18 mic which requires phantom power connected to a studiolive III 32SC. My issue is that I cannot fully mute it. I am still picking up sound for my livecast (USB out). I am resorting to turning off the phantom power as a mute which isn’t ideal because of a noise when turning it on. My dynamic mics in the same config are muting fine. Is there a setting that I need fit these condenser type mics to mute?