A-123-2 6/12/18/24dB High Pass

Doepfer's voltage controlled highpass filter with four outputs at once, 6, 12, 18 and 24 dB per octave, and voltage control of the resonance; the successor of the A-123.

Key features

• Voltage controlled highpass filter on the CEM3320/AS3320, four simultaneous outputs: 6, 12, 18 and 24 dB/octave
• Frq sets the cut-off; FCV1 at about 1 V/octave, FCV2 through its polarizer FCV2
• Q sets the resonance; QCV controls it through its attenuator CVQ
• Lev sets the input level, with clipping from about 5 at typical audio levels
• More CV feedthrough than other filters with fast modulation at low audio levels, as the maker notes