How did Archie make that Scary Introduction last Saturday?

Heh heh!

It was done using my all-purpose sound editor, Audacity.

Given a piece of sound, Audacity can do lots of things with it.

(1) Make it louder or softer.
(2) Edit it; that is cut piece of sound out of one place, and insert in another place; trim a piece of music as desired, and rearrange it.
(3) Speed it up, which means of course, the pitch rises.  Or slow it down.
(4) Speed it up or slow it down at the same pitch.  This is very clever; the piece is analyzed into individual notes, and the frequencies of each note, and its duration.  Then the duration is increased, leaving the frequency alone, and finally the piece is reassembled.
(4) Raise or lower the pitch, keeping the speed (the Tempo) as it is.

What I did is to [1] make a copy of the initial segment of the tune, where I say: "If you or someone you love ...".
[2] Then I pasted it somewhere away from the Intro, and raised the pitch an augmented fourth.  This is an interval that sounds unsettling (for instance, B to F).
Then [3] I pasted the modified copy alongside the original.  Now I had two voices, speaking exactly an augmented fourth apart.  If it had been two different people speaking at the same time, it would have sounded quite normal.  But since it was me speaking at two pitches, it sounded strange.  In addition, the music, too, was shifted.  That was the whole thing!

Actually, I did one more step.  Audacity can, in addition,

(5) Do a sound effect called Phaser.  What this does is to switch the Stereo channels back and forth from Left to Right in such a way that it seems to rotate around the room.  It is a combination of gradually switching channels, and making them louder and softer in rotation.  (This effect was available in Hammond Organs back in the Sixties, by rotating speakers inside the speaker boxes, and it was called Leslie!  Nobody has rotating speakers anymore, but a fake Leslie effect can be obtained with this Phaser effect, and it is actually superior to Leslie.  It can be used over the speakers in an Auditorium, for instance, which you could not do with old-time Leslie.

Anyway, I hope you enjoyed all that nonsense, and how it was done!

Archie.