lol Sorry - didn't mean to make things more confusing. Let me to explain it this way:
On the left side of the diagram, which is for the 401, where ever it shows the "Selector Patterns" knob, those are the built-in stitches & dial settings. (Example: Zig zag, Ball, Domino) Where it shows "Special Fashion Discs" & "Fashion Discs", those are the individual discs that can be purchased and used to do the stitches not available with the built-ins. (Example: disc 11 ribbon stitch, disc 1 arrowhead stitch, disc 5 banner stitch, disc 21 chevron).