The clock setting lets you change the internal resolution of the pattern, and determines the time value of each step. For example, if you select 1/8 then each step in the Arpeggiator will be equal to an eighth note. In addition to straight steps, triplets and dotted note values are available from the Clock menu.

Available ranges are:

Straight steps: 1/1 ~ 1/64

Triplets: 1/1 triplet ~ 1/64 triplet

Dotted notes: 1/1 dotted ~ 1/64 dotted