Hi Gerry! The Mix and Match feature allows you to select a certain exercise and then it returns to the menu and then you can select the next one you want to do or repeat then one you just did. Whereas if you go into a chapter, it continues to play from whereever you start. So there isn't any specific automation to the Mix and Match feature. However, in the Body Blast Series, Cathe had a Workout Blender feature that allowed you to pick up to 5 exercises or combos and then they would play in the order you want (or repeat if you want).
Hope that helps.
Jo