I'm sure there are many, many tapes that were pre-recorded based on their plans, which could be played "After the Fact". Clever...NOT.
You have to search for how generic they are.
The fact that we have audio and not video says a lot. This is a man of vanity. If he's not dead (though I think he is) he's terminal.
Interesting connection there to Asimov's Foundation book. Around the time bin Laden was a teen it was translated in to Arabic. Foundation was translated as Al Qaeda.
The hero of the story communicates via tapes -- long after he's dead.
Krusty: [on TV] Hi Kids! Welcome to Kamp Krusty! Hoo huh hoo heh ha heh! I'll see you in a few weeks! Until then, I turn things over to my bestest buddy in the whole wide world, [obviously dubbed] . I want you to treat with the same respect you would give me. Now here's .
-- Welcome to ``Kamp Krusty''
In fact, the dubbed voice is that of Mr. Black himself, their head counselor.
For the past 15 years I was president of Euro-Krustyland... until it blew up. -- Mr. Black, ``Kamp Krusty''