This probably known by most users. But I post it nevertheless, because it is so cool.

From www.korgkaossilator.com:
“KAOSSILATOR “Easter Egg” Lets You Record Four Measure Patterns
KAOSSILATOR does double duty! Yes, those uber-clever designers snuck in a way to record FOUR measure phrases! You can access this capability by holding down the TAP/BPM and LOOP REC/PLAY buttons while turning on your KAOSSILATOR. Once you see “DLY” on the screen, let go. The KAOSSILATOR then allocates its undo memory to recording memory. Once you see program “L.00”, hold those buttons again to enter the length mode, and turn the dial clockwise to select a length of “16” steps instead of the previous maximum of “8”.

Voila! Four measure patterns for twice the enjoyment!”

Yeah!