I absolutely agree that the "theoretical explanation" in the video is bogus. Pitching up a sample is when high frequency information above Nyquist is lost (or a

I absolutely agree that the "theoretical explanation" in the video is bogus. Pitching up a sample is when high frequency information above Nyquist is lost (or aliased back down, if your sampler is garbage). When a sample is pitched down, the overall timbre obviously becomes darker, and there's an empty gap left to the top. The sample's highest frequencies might also become more perceptible and pronounced because of imperfections in human hearing and playback systems. That particular argument in the video is flawed, but the point was this incredible shift in mentality that it's perfectly fine to be very crude in the process of sampling. This also helps with the purpose of inviting more people to try out sampling. Pianobook is filled with great instruments made by first-timers.