How to synchronize a group performance?

[cheling]

When performing diabolo in a group (2 or more), how does one synchronize all the tricks so everyone in the group is performing the same move? I've seen some count aloud. Perhaps music cues could work, but in classical music it seems more difficult to find those cues. Any suggestions would help. Thanks!

[Graham Milligan]

just basic beat counting, with lots of GO's.

1,2,3,4,5,6,7,8