Switch page and button above, or click Device/Mute/Solo/Record Arm right on the diagram: the labels on the 16 buttons (and the two Mid/FX knobs) update themselves.
Play lights up while the deck is playing, Headphone Cue while that channel is being pre-listened in the headphones, the active loop-size button stays lit, Key Lock stays lit while the pitch is locked.
For now it only lives on Solo (set/jump to hotcue) and Record Arm (delete hotcue). Device and Mute on this page aren't mapped yet — free room for later.