Nope that’s not it either, I had checked that before posting the first time. If you look at the images the master audio track simply are not there. I’ve tried generating a new sequence the since normally when you first create one Master Audio is part of the tracks automatically generated but their are none for any flavor of sequence I create. Is this something specific to an iMac? My previous edit machine, which was an HP Z820, always generated a Master Audio track both in any sequence and in the audio mixer. But for some reason it’s not with this iMac. I was recently relocated from one office to another so I don’t access to the HP workstation anymore, btw.