STG Soundlabs make 5U modular amongst other things, they are also behind the Knobcon event itself. We spoke to Moot Booxle about the the muSonics modules - starting with a VCA based on the Moog 902, and also the MooSonics - which is a budget more DIY range with PCB panels available as DIY kits first, then prebuilt later.
More info http://stgsoundlabs.com
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