If you are referring to the first video clip linked in my post above, that is the 'normal' agitation action on the Perm Press cycle. Normal and Perm Press use 'normal' speed. Delicate & Woolens uses 'delicate' action. Heavy Duty uses 'heavy duty' speed. That's the arrangement on my machine, anyway.
The SmartDrive motor responds to the load it senses from the clothing and adjusts the wash action accordingly, varying the force, speed, and arc of the stroke to a degree. By running a video (tape) at fast-scan, it's more obvious that the action will sometimes move the load progressively around clockwise, then counter-clockwise . . kind of like the indexing on the Catalina, but in both directions . . . while rolling it over at the same time.
A load of jeans on the Regular cycle would get somewhat more aggressive agitation than a load of casuals. I usually use Regular for jeans, but sometimes Heavy Duty. Trust me . . . jeans on Heavy Duty get plenty of action!
Water level and load size is also considered. Running the lowest water level without any clothes, Regular and Heavy Duty have virtually the same agitation. But add some clothes and the difference becomes apparent.
My machine has what F&P calls "Maximum Wash Profile," which comes into play on the Regular cycle with very heavy, large loads. I read about it on a tech sheet, but had never seen my machine do that. Then I finally did about a month ago. I was running a load of towels/socks/cottons on Regular. A very large load, moreso than I usually run. I was watching, in case anything unusual happened. It auto-selected the high water level and was a few mins into the wash, when the agitator suddenly made an extra complete revolution at the end of a stroke, went into an odd mix of short and long strokes for a bit, then settled into a more aggressive action than Regular normally uses. Very interesting.