funkstill-filter-threek-13700

Funkstill Filter Threek 13700

Analog three-pole morphing filter

14 HP Eurorack module

Filter Threek 13700 is an analog three-pole morphing filter with six continuously blendable, CV-modulatable filter types.

Features

  • Self-oscillation, continuous voltage-controlled mode, voltage-controlled resonance, linear FM, waveshaping between modes, and two assignable CV inputs.
  • A diode circuit, rather than VCAs, continuously crossfades between filter modes.
  • At the centre transition, the signal is inverted and behaves as a blend of rectifier and filter.
  • With Resonance fully clockwise, the filter self-oscillates as a sine wave that can be played tonally via 1V/Oct.

Controls & Jacks (31)

  • Frequency— Sets the filter cutoff frequency.
  • Mode Toggle Enable— Enables automatic or externally controlled switching between the alternate middle filter-mode variations.
  • Resonance Type— Selects one of two additional resonance-character variations.
  • CV1 Amount— Bipolar attenuverter for the CV1 Input.
  • Resonance— Sets filter resonance; fully counter-clockwise drives the filter into self-oscillation.
  • Mode CV Input— CV input for continuously morphing the filter mode, including audio-rate modulation.
  • CV2 Polarity— Turns CV2 off, on, or inverts its polarity.
  • Mode Toggle Input— Control input for switching the two middle mode variations when Mode Toggle Enable is on.
  • 3 Pole Output— Main three-pole filter output, providing the selected and continuously morphed filter mode.
  • 1 Pole Input— One-pole filter signal input; use this input with Input Level fully counter-clockwise to obtain only the one-pole output contribution.
  • CV2 Amount— Sets the attenuation of the CV2 Input.
  • CV2 Input— Assignable CV input with attenuation; it can modulate frequency, mode, or AC-coupled linear FM and has destination-dependent internal normal
  • 2 Pole Output— Two-pole filter output, providing LP, HP, BP, or all-pass responses according to the Mode setting.
  • 1V/Oct Input— One-volt-per-octave cutoff-frequency control input for playing the self-oscillating filter tonally.
  • CV1 Input— Assignable CV input with bipolar attenuation; it can modulate frequency, mode, or resonance and has destination-dependent internal normaliza
  • Audio Input— Main audio input, normalized so the 1 Pole Input can be mixed into the three-pole filter path with the Input Level control.
  • Mode— Continuously morphs among the filter modes; the diode morphing circuit also produces waveshaping and inverts the signal around the center tr
  • Frequency CV Input— Cutoff-frequency CV input; its amount control acts as a fine-tune control when nothing is patched here.
  • Mode CV Amount— Sets the attenuation of voltage applied to the Mode CV Input.
  • CV1 Destination— Assigns CV1 to Frequency, Mode, or Resonance; the selected assignment also determines its normalized internal source.
  • LP Compensation— Enables compensation for the level loss caused by increasing resonance in applicable low-pass and all-pass modes.
  • Frequency CV Amount— Sets the attenuation of voltage applied to the Frequency CV Input.
  • CV2 Destination— Assigns CV2 to Frequency, Mode, or AC-coupled linear FM.
  • Band-pass Family— Indicates that the two middle mode positions use the band-pass combinations.
  • Mode Toggle Destination— Selects whether automatic mode toggling occurs at the high-pass, low/high middle, or low-pass position.
  • 3LP Mode— Indicates the 3-pole low-pass mode (-18 dB/octave).
  • 3HP Mode— Indicates the 3-pole high-pass mode (-18 dB/octave).
  • Input Level— Sets the level of the main audio input mixed into the three-pole filter path.
  • All-pass Family— Indicates that the two middle mode positions use the all-pass combinations.
  • Middle-Low Mode— Indicates the left middle mode position: 2-pole low-pass plus 1-pole high-pass band-pass, or its toggled all-pass variation.
  • Middle-High Mode— Indicates the right middle mode position: 1-pole low-pass plus 2-pole high-pass band-pass, or its toggled all-pass variation.

Explore the interactive Filter Threek 13700 panel on BleepDex — tap any control to learn what it does.

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