we have recently relocated studios and a strange issue has occurred with the mixer. Usually you could press the red REC button on the mic fader (or any fader) and it would isolate your mic from the computer soundcard output so you don't get the music being recorded back into the computer (Myriad), utilising the internal Record bus. However it now doesn't always do this, sometimes it will be a clean recorded feed but mostly it records the music extro and intro back in with your voice link.