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