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Spoiler

Most instruments are a fantastic illusion, kind of like film. If you slow down a film too much it will just become a series of images, and likewise if you slow down a guitar too much, it will cease to sound like a guitar.

BUT

If you slow down a synth, it will always sound like a synth, because it outputs a clean, consistent waveform. That's how I confirmed my suspicions about the "guitars" on Discovery. They still "hold their shape" (i.e., still sound the same tonally, just at a lower pitch) when slowed down, which a real guitar wouldn't do.

This is a really good explanation. I never thought of it that way.