[...] I&#8217;ve been working on a step sequencer design for a while based on the 4017 decade counter. I&#8217;ve finally gotten around to building a working prototype! I posted the schematics here a few months ago. You can also find them on the step sequencer page which I just uploaded.  I also uploaded an awesome recording of the sequencer in action. The recording was made using the sequencer to trigger three different synths. A casio SK1 was used to make the melodic sounds.  I used a Korg MS20 to make the bass drum beat. The other rhythmic tones were made with a Paia modular synth Here&#8217;s the step sequencer page. [...]