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Through Zero VCO
Full equipped VCO with LinFm modulation. Lin FM produces typical FM spectras and is CV controllable for dynamic sounds.
https://klangbauköln.de/klangbau-in-koeln/tz-vco-is-coming/
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Included in 39 Racks, 16 are public:
Weston Precision Audio TZ0 Through-Zero
LA67 T-ZED Oscillator thru-zero phase