ALL (default)

The step is always fired.

PRE

The step will fire if the previously evaluated step condition was TRUE (means the closest previous step with condition was fired).

PRE not

The step will fire if the previously evaluated step condition was FALSE (means the closest previous step with condition was NOT fired).

1st only

The step will only fire in the first loop cycle of the (complete) pattern.

1st not

The step will NOT fire in the first loop cycle of the (complete) pattern, but it'll fire in all following loop cycles.

X%

Here you can select a probability percentage from 5% up to 95%. If you select 50% for example, then the step will have a 50% chance to get fired.

Xth:Y

This will fire the step at ever Xth loop cycle of the (complete) pattern out of Y cycles. You can select each cycle of a range of 2-8 loop cycles, starting with 1st:2 up to 8th:8. If you set 2nd:3 for example, then the step will only be fired at the 2nd loop cycle of the pattern, then on the 5th, then on the 8th, and so on.