With my "usual" arrangement (see above), if I pull up the divider that separates 'tracks' from 'buses' in TrackView, and click the "Bus" button in the Inspector ... I can add 5 effects to my master bus and each time it expanded to make each visible. On the 5th Bus effect, the little (+) plus sign disappeared, but by going to another Screenshot, and then back again, it re-appeared. Bottom line it seems that I can put 4 effects on a Bus with no problem, but beyond that it gets a little squirrely, i.e., with 6 FX on the bus I can't make the (+) plus sign come back. ????