A-121d Dual Multimode Filter

Dual multimode filter

Doepfer · 8 HP · 3U

Panel · 40.6 × 128.5 mm

Description

Doepfer's dual multimode filter: two filters tuned together by a master frequency and spread apart by Delta, with a small mixer that sets up their modes.

Key features

  • Filter 1 with highpass (H1) and bandpass outputs, filter 2 with lowpass (L2) and bandpass (B2) outputs
  • Frequ. tunes both filters, Delta spreads their frequencies apart; both under voltage control (FCV ~1 V/oct, DCV)
  • Q1 and Q2 set each filter's resonance; FCV1 and FCV2 attenuate each filter's own frequency CV
  • A mixer (Mx1, Mx2 to MxO), its inputs normalled to the two bandpasses, builds the other filter types
  • In2 normalled to In1, FCV2 to FCV1; In1 and In2 set each filter's input level
  • Standard (aluminium) or Vintage Edition (black) panel

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