Introducing dpf, 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 dont 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 dpf 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. Features 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