https://buymeacoffee.com/ozhalljr
This in depth video covers the 1630 Bode Frequency Shifter. It is in three parts.
Part 1 includes background information like the Harmonic Series and Ring Modulators. This background is essential to understanding what a Frequency Shifter is.
Parts 2 and 3 of this series answer the question "How can I use a Frequency Shifter musically?".

1630 Bode Frequency Shifter 1974 Moog datasheet
https://moogfoundation.org/wpcontent...

Doepfer A126 Frequency Shifter manual
https://www.doepfer.de/a100_man/A126_...

PerfectCircuit.com article
https://www.perfectcircuit.com/signal...


TIMECODE
0:00 Intro
0:28 Designer Harald Bode
1:12 Overview of video series
1:58 What does a frequency shifter do?
2:18 The harmonic series
3:34 Ring modulator
4:49 Frequency Shifter
5:38 What a frequency shifter does
7:55 Frequency shifter vs pitch shifter
8:40 Part 1 conclusion