Song is "Waiting for the End" by Linkin Park.
Ill link 2 videos and the times when the sound starts.

I cant figure out what it is. i thought it was someone DJing his voice on the word "all", but when you watch it live its just a keyboard, but it sounds different than the album version. so now i just have no idea

Heres the original, the effect/sound starts at 3:04.

but then here it sounds a little different, is it just a keyboard with effect? anyone know what effect? i really like the way the album version sounds. starts at 3:03, can hear it under the guitar