There’s a Wikipedia page on how these techniques work. https://en.m.wikipedia.org/wiki/Missing_fundamental https://en.m.wikipedia.org/wiki/Missing_fundamental

There’s a Wikipedia page on how these techniques work. https://en.m.wikipedia.org/wiki/Missing_fundamental https://en.m.wikipedia.org/wiki/Missing_fundamental I’ve played pipe organs that do the same thing with “resultant” stops to fake 32’ or 64’ stops.