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Doepfer A-103 18dB Low Pass Filter

Module A-103 is a voltage controlled low pass filter with 18dB/octave slope. The circuit is based on a modified transistor ladder (Moog ladder) and is a reproduction of the legendary TB303 filter. 

- manual control of filter frequency 
- 3 CV inputs (CV1, CV2, CV3), 2 of them with attenuator (CV2, CV3) 
- input level control 
- resonance control up to self oscillation