The A-105-2 from Doepfer is an analogue 24 dB Lowpass filter with SSI 2144 chip and successor of the no longer available A-105. If you love the sound of synthesizer classics like PPG Wave 2.3, Korg Monopoly, Polysix and Trident or Siel Opera6 the A-105-2 is perfect. There are two audio inputs, the first input is adjustable in level. For modulation of Cutoff and resonance, a total of three control voltage inputs are available. The audio output is mono.