When I was on the parade, we wait outside in our floats behind the gates from Fantasyland, where the Parade Route starts. The CM next the floats waits for the signal in their walkie talkie from the "Parade Director" inside the Parc.
When the "ok" was come, the music starts and the Parade go on ...... So it was the whole Parade, if we was to close to the next float, a CM get a signal too to regulate it .....
Alexandra
(Sorry again for my bad english)