Sorry I missed a step in my workflow because I took it for granted. In bold font the text added. 2. Add a new Video track (Shift+T shortcut) and two Audio tracks (t shortcut) for your audio (Left+Right channels?) without video: you are adding an empty Video track because "Align Mixers" feature needed a Video track. 2.1 Move the Video track down until it is on the top of the two Audio tracks. *2.2 Insert your Audio into the two Audio tracks in the usual way.* 3. Open/Create a ... An other little thing, in the Menu--> Window--> Mixers... there is the item "Align mixers". I would suggest to change that from "Align mixers" to "Align mixers...". Usually the three dots indicates it is not an "immediate command" but it opens a new window. Thanks Phyllis and Andrea!