Thanks CentralFan1976 for providing the info (particularly your video) to 'get me over the hump' so to speak. It was much appreciated.
Although GRJ (whose opinion I respect very much) had expressed doubts that this would remedy the 'out of sync motor' issue I was experiencing with Lionel's AC open frame motors on the TMCC equipped powered pair of my PWC CP F3s - each of which are dual-motored - I was pleasantly surprised that adjusting the 'Stall' setting resolved the problem; and the engines have been running together fine ever since.