A-121s Stereo Multimode VCF

Stereo multimode filter

Doepfer · 12 HP · 3U

Panel · 61 × 128.5 mm

Description

Doepfer's stereo multimode filter: two 12 dB filters, morphing continuously from lowpass through notch and highpass to bandpass, with common and single controls for stereo or dual mono use.

Key features

  • Two 12 dB multimode filters (the A-121-2's core), type swept continuously LP - N - HP - BP
  • F tunes both filters, Delta F spreads them apart; F input ~1 V/oct, Delta FM through its polarizer
  • SFM1 and SFM2 polarizers per filter, CFM a voltage controlled polarizer on both CFM inputs
  • Q sets both resonances; Type 1 and Type 2 set each filter's type, Link to 1 lets Type 1 set both
  • QM/TM1 and QM/TM2 modulate resonance or type, as set by internal jumpers
  • Standard (aluminium) or Vintage Edition (black) panel

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