HI !
I did this video a while back, it shows 1 use of Parts.
Essentially, they are like a Kit on the MD, in that you can assign a different slot to any of the 8 tracks, along with different effect settings and scene settings.
They are the heart of the OT, and without using them, you’ll quickly run into a wall where you’ll wonder what happens when you want to use a different slot for a track, but stay in the same project.
Also, because you can quickly reload a Part, they are used to create buildups and fills, really tweak your sounds out of control, and get back to a saved state with just one action. Very powerful for live performing 
hope this helps!
cheers
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