Instruo Dapf Dual All-Pass Eurorack Filter


The module is a dual all-pass filter and can be employed to create classic phase-shifting effects, psychoacoustic stereo enhancement and even synthetic Doppler effect!

Functions: Filter , Stereo , Waveshaper
Height: 3U
Width: 4hp
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Introducing dåpf, the first dedicated effects processor in the Instruo product line.

The Instruo dapf is a set of two analogue all-pass filters.

You might be asking yourself, “What is the point of a filter that passes everything?” All-pass filters don’t actually attenuate frequency amplitudes directly, but rather alter the phase relationship of frequencies across the spectrum. All-pass filter stages appear in the vast majority of voltage-controlled filter topologies as well as serving as a core building block within DSP.

The normalled I/O of dåpf allows for cascaded or independent use of the two all-pass filter circuits, offering everything from classic phase-shifting to psychoacoustic stereo enhancement and synthetic Doppler effect.


  • Two parallel all-pass filters
  • Independent attenuverters for voltage control
  • 1-Pole/2-Pole configuration for left channel
  • Cascaded normalisation
  • Global 1 volt per octave tracking
  • Width: 2 HP 
  • Depth: 27mm 
  • +12V: 10mA 
  • -12V: 6mA

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Instruo Dapf Dual All-Pass Eurorack Filter