im sure its a bit of both. I think theres a little room with a cubicle in every city and some random person is payed to sit there and watch each mission through a monitor(probably thinking theyre watching a game show or something) and give feedback to everyone and draw a little scetch for each person, this then gets sent somewhere to get filtered to make it sound like gantz. example: Kato is always getting hurt. Gantz filter: Goddamn it Kato why you always dying lol.