Pitch-shifting is, in many ways, a natural counterpart to time-stretching. The easiest way to change pitch on a tape recorder is to change the speed of playback, as we already know. However, in the context of an ordinary tape recorder, this would also change the tempo/duration of the piece being played back, so it wasn’t pitch-shifting in the sense that we know it today, where a change in pitch has no effect on duration. That would require something a little more complex than a straightforward tape speed adjustment. However, it didn’t need, as many people thought it would, a digital revolution to make it possible.
A Brief History of Pitch-Shifting
Analogue circuitry was used in electronic keyboards ...
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