How Multi-Power works. Part 1

Here we go, the first part of how multi-power works. I underestimated how much I wanted to cover in it so it's going to split up into two or maybe even three videos for easier digestibility. Enjoy.
It's not a How To video and don't message me to say that Dual Power was better. Dual power didn't arrive for another ten years or so. Select-O-Speed was a different matter, it was 20 years ahead of its time. But that's a different story.