Quote Originally Posted by FFN View Post
I've seen people report that he plays different sound effects in both modes if you plug a MechTech weapon into the active MechTech port (the one with the button inside it). I think it's the one on the left side of the truck.



They would have done the electronics for Sentinel Prime long before Bay cast Nimoy, I think. But yeah, most of the talking Movie Optimus Prime toys since the running change of the Optimus Prime helmet in 2007 have used Peter Cullen.
Yeah,
if you plug in a MechTech weapon on his active port, it makes the same sound as Leader Jetfire walking robotic movement sound. when you unplug it it makes a transformation sound. also when the weapon is in active port, if you press the button that makes the siren noise, it changes to shooting noise. also when you press his speech button it says "Good to see you alive Optimus" and " What has happened to the Allspark?"

pretty awesome!