So, you know how before you start a festival, etc. Your Idol's go "3! 2! 1! *insert cheer here*" Is there a way to tell which cheer they're going to shout? I'm pretty sure it has to do with the blinks/facial experssions of your leader, right?
For several characters, you can go by the blinks/facial expressions (often on "ei! ei! o!"s they blink inbetween each) but the best way, in fact, is go by the mouths. Like, it just has the general "my mouth is moving and not actually matching what I'm saying" lipsynch but essentially, by the spacing in between them you can tell, like animagic4u said.
The Japanese Wiki has them like this (if you can imagine it, I think they have it done pretty well):
◯◯◯-◯ = ターッチ ("touch!" a la high-five)
◯◯-◯◯◯ = トップアイドル ("top idol!")
◯-◯-◯◯◯◯ = エイ!エイ!オー! ("ei! ei! o!")
◯◯--◯◯◯◯ = ファイト!オー! ("fight! o!")
really, it's only hard to tell between "touch" and "top idol" if you're not paying attention closely. The latter two are giveaways~