What's this guy doing on the 16th trig?

Finally almost through the manual. OT is a beast! Still soaking up all the videos and tips I can find before I start on any real projects. Just watched this video again and noticed he’s constantly fucking with the 16th step trig pad. Is it just a sample he’s triggering or did I miss something in the manual? Compiling a list of shortcut key combos and functions etc for quick ref… Thanks.

Activating Delay for the Master Track with the 16 trig, and controlling delay time with left hand.

Pag 85.

Thanks, I remember now, I didn’t pay that section much attention cos seemed like something to learn later/I’m not really in to the stutter/roll thing normally, but from seeing that vid and knowing that’s what’s going on it like a pretty cool feature to try out.

Hes also chaning scenes in between.