[sdiy] frequency shifter

[ColinMuirDorward]

Hi, I got a little lost trying to understand what a frequency shifter is. I
mean the pre-digital method used by Moog (I think?).
I recently built a 4pole APF, and was really impressed with some of the
pitching effects I could achieve with it. I'm guessing this is an entirely
different method than the frequency shifters like Moog and JH have done.
Is the APF method used by anyone? What are its limitations, and what is it
even doing?
Well, I guess I'm just looking for some conversation on the topic of analog
frequency/pitch shifting methods. If anyone has any thoughts/experience
they'd like to share.
Cheers,
Colin

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