I built my first mechanical sequencer in 1978 from a cassette recorder motor &amp; a rotary wafer switch with the end-stop removed. I hooked up the 12 switch positions on one wafer to small bulbs, &amp; the other wafer to 500k pots &amp; a home-made oscillator. I can still hear the noise it made..... many happy memories. I'm working on a variation of the 960 at the moment- I want something much more compact but with discrete f/f to allow skipping of steps.