this is a nice little circuit who come from “the electronic drum cookbook” by Thomas Henry. He names it the “Beat follower”. This circuit produces a CV stepped-staircase waveform from an external clock. I have slightly improve it by modifying the clock input, adding a reset input, and an indicator led for the cv signal output.
Here is some documentation who will give you an idea of what it is possible to do with this circuit which I consider as a small bonus
The original schematic:
I’m sure that it existing same type of circuits who are better and more complete as this one but it is a really cool little project for add in a drum box for exemple