You can set delay, effect type and randomize.
[testimonials category="all" time="10" effect="fade" ][one_third][testimonials category=”all” time=”15″ randomize=”on” effect=”fade” ][/one_third]
[one_third][testimonials category=”all” time=”10″ randomize=”on” effect=”fade” ][/one_third]
[one_third last=last][testimonials category=”all” randomize=”on” time=”5″ effect=”fade” ][/one_third]
[clear]
[two_third] [testimonials category=”all” time=”10″ effect=”fade” ] [/two_third] [one_third last=last] [testimonials category=”all” time=”10″ effect=”shuffle” ] [/one_third] [clear]