At the moment I am working on my rack dedicated to percussive/drum elements. I builded a simple adjustable tom sound circuit that I found here:http://www.modularsynth.ru/endiy/adjustable_tom/
I stuck an echo / delay effect on it output and I found the result so fun that I decided to make an original module out of it. I used and I modified the famous Chinese kit with pt2399 (available on aliexpress, eBay, etv …), in particular by adding a CV input for a control of the delay time.
Here is a first sketch, I will re-check and re-test all that, then I will come back with a more presentable diagram and with some examples of sounds obtained, for those who would be interested on this.
Work in progress …