No info about availability.
303 inspired oscillator
TO3, a VCO, inspired by the tb303 oscillator, with sub-oscillator
-Only 6HP wide (30mm)
-Only 30mm deep
-less than 25mA @12 and -12volt .
http://www.dtronics.nl/pages/modular_to3.html
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Included in 24 Racks, 15 are public: