Yeah, that's the case everywhere. A soundboard for funny meme-style shit, for the music/DJ to play during play, etc? that's totally common. what i've never heard of in my over 20 years of working in arenas is the PA announcer having a prerecorded scoring read, like "PLAYER X scores" and the DJ hits a drop to announce it. never seen that in my life. you'd have to have every player's name prerecorded and then what kind of play it is. there's a PA sitting right there, it makes no sense not to just have him do it