The style reset button sounds interesting, though not quite sure in what situation one would use it.
Rikki, I'll simplify that function for you. When you press the "reset" the style/beat begins again at the 1st count of the measure, so if you 're playing a song in 4/4, like "All You Need IS Love" (Beatles) that switches into 3/4 every so often - you can press the "reset" button whenever you need to sync up your downbeats.
ie:
(1) There's (2) nothing you can (3) do that (4) can't be
(1) done ... (2) ... (3)
(RESET)
............ (2) Nothing you can (3) sing that (4) can't be
(1) sung ... etc
Lots of songs throw in a measure, or two of a shorter length, and this button allows you to keep all your downbeats in sync. How this was easy to understand.