An explanation as to why Springtrap can talk in FFPS
Since in the game we can clearly see William rebuilt himself with new parts(unless you believe Scott retconned Springtrap's appearance, which I don't believe is the case) from old animatronics he probably put something similiar to Funtime Freddy's voice synthesizer on himself.
Either that or Scott didn't think too much about it and I'm basically covering a plothole for him.
Posted Dec 19, 2017, 7:35 PM UTC
He talks because the series has hired voice actors now and it didn't during FNAF3. If the PJ Heywood William voice existed back then, I'd be willing to bet Springtrap would have talked in FNAF3 as well.
I wouldn't really call this a plot hole anyway. Nothing says he was physically incapable of speaking in FNAF3, he just happened to never do it.
I agree that it was for technical reasons, but in-universe it's still weird that William never talked in FNAF3, so I guess you can take this post as me coming up with a reason for it.
None of the animatronics ever talked until SL, Scott just decided he liked the voice acting and stuck with it.
He would occasionally moan a deep voiced "help... me...".
I think it was just what people heard, but was simply a sound effect(like Foxy's "FREEDOM").