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[[File:Hordijk_pf.png|thumb|right|200px]]The 2U wide '''Rob Hordijk Phaser Filter''' module combines 5 allpass poles with three lowpass poles in one module. The five allpass poles are configured as a phaser with positive feedback resonance control, creating two resonant peaks when opened. Then a crossfade knob fades between the input and the output of the phaser and this crossfade mix is the input signal into the lowpass filter. At the end of the allpass chain before the crossfader is a phaser monitor output. The lowpass section has a cutoff slope of -18dB/Oct and its own resonance control.
[[File:Hordijk_pf_fc.png|thumb|right|200px|The Phaser Filter flowchart]]Both the phaser section and the lowpass section have a 1V/Oct control law. The phaser has one modulation input and if it is not connected the audio input signal is used as the modulation signal. This allows for dynamic waveshaping of the input signal on the time axis without detuning to signal.
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