Available as an assembled Module and as a DIY project.
This Module is currently available.
VCF / VCO with a "Filter Exciter" section
This module is based on ideas presented in Electronotes #132. It is a VCF with a 'filter exciter' section to allow a wide variety of acoustic, semi-acoustic and not-acoustic-at-all sounds. In a sense it takes the concept of pinging the LPG or ringing a VCF one step (or 2) further. The decaying sound is fed back into the input via a VCA. The VCA can be controlled by a gate or an envelope (or both).
Another interesting point is higher frequency sounds tend to be louder.....which is what happens naturally in the big room.
https://www.nonlinearcircuits.com/modules/i-cant-believe-its-not-a-vco
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These merchants probably sell this module. Huh?
Nonlinearcircuits I Can't Believe It's