I don't know if this is just my ears that don't work, but the stuff that Barry-Cade screams at BB in the movie's first bot-on-bot fight sounds markedly different to when SS et al talk to each other just before the attack at the end of the movie. Barricade speaks in what sounds more like a spoken language (similar to Megatron's speech) and SS, Bone-crusher,Barricade etc communicate in a more tumbling sort of sound at the end. Two Cybertronian methods of communication? (3 if you count English and a very flimsy 4 if you count that uplink screech when they hack the computer database). Is this mentioned in any literature? I haven't found any references, even in the search function on this site.