Here is a diagram of the eight settings with "O" being accented:


1) 0000 (normal tremolo)


2) 0-0-


3) 0--0--


4) 0---0---


5) 0--0--0-


6) 0-0-00-0-0 (this one is in 5/4)


7) 0--0--0-0-0-


8) 0--0--0---0-0---