The Doepfer A-103 18dB Low Pass is a Eurorack-format filter module designed for modular synthesizers. It features a voltage-controlled low-pass filter with a slope of -18 dB/octave, based on a modified transistor cascade (Moog-style), replicating the classic low-pass filter of the TB-303. The filter frequency can be modulated manually via a controller or through control voltage (CV) inputs, two of which include individual attenuators for precise modulation control. The module's resonance can be adjusted manually and can reach self-oscillation, making it versatile for a wide range of synthesis applications.