Found this schematic and about to try it out !! Sounds pretty great. swap out two caps for a cymbal or Snare, easily add decay CV with a vactrol, or a simple filter to output, could also use a switch to those replaceable caps to give Snr or HAT selection. Gonna build this todaY 
Would be a great addition to the Kosmo format = simple design, common components, all analog sound source, possibility for expansion a great learning tool.
I have a few units that use an a âghetto decay gateâ like this. One thing to be aware of is that the cap doesnât always charge fast enough to trigger every time, so for things like high-hats and rolls it can sound a little faded-outey. But it is, as you point out, pretty simple and elegant.
Let us know how you get on, simple enough to put together and I think I have all the bits.
How did it turn out?
Sound samples?
Mine was pretty shite. I built these about a year ago:
sâcurrently private m8.
This was my first attempt to get this thing workingâŠriiiight before I had to move, so Iâll see if I can troubleshoot it after I get into the new place. Didnât work the first time I put it together, but it was my first attempt at freehanding a schematic straight to stripboard cause my breadboard was full haha.
It was stuck in âdraftâ somehow-thanks for the heads up @Caustic!
It actually sounds good dude. With a few tweaks it could be made more playable im sure. The sound isnt bad though.
i made this one only for hit, (i donât like so much the snare, i have made other one snare module)
i add a buffer out and vactrol on decay and i thinks itâs a cool simple module !
the post on my web site (with a best schematic quality) :
super easy to throw a switch on there to give different tonal characteristicâŠlike hi hat or snr or just gnarly hit. Iâm mostly after industrial / techno sounds, so gnarly = beauty haha.
cool sounds !! how do we filter out some of the gate sound ?? sometimes its desirable but would be nice to throw it onto a pot to dial it in.
Iâm still at the âno idea what Iâm doingâ stage so can barely build circuits from schematics but its fun anyway haha.
Well, I donât think youâre really hearing a sound from the gate in either of the ones I was playing. The cymbal kind of has a âghetto gateâ but that Wasnât making a sound of its own. The bass is a twin-t so itâs already not really much more than a low pass filter that self-resonates out. They could be good for industrial though-especially as samples with heavy effecting!
well well, I am in luck for my monikor is Military Industrial Complex, and Industrial metal is what I dooooooo⊠may transform into industrial techno from all this modular obsession though ahahahaha.
I didnât think your sounded like shit, unless maybe itâs just sounds that sound like shit that Iâm after ahahah. if I wanted beautiful sounds Iâd go open up a VST like omnisphere 
What did you end up using for the input resistor?
honestly I donât remember, in the original diagram the guy says that resistor (4.7) is not even useful in certain cases, I must surely keep 4.7k,
i think âtry 47k / 100kâ i wrote this on the schem because iâve seen it in a forum, so i try it but with not really change
on the other hand I added an op amp to the output because the level was very little and a small vactrol on the decay pot to make open variation closed with an external CV
and the decay pot is a multi tour
This was covered in the modular in a week series on YouTube
