How Does It Work?#

MS-20 HPF is a Korg 35-inspired highpass filter with Cutoff, Res, and Drive, built for aggressive low-end removal and distinctly raw resonance.

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Quick Overview#

• MS-20 HPF is a single-input, single-output highpass filter.
• It provides one large Cutoff control and two smaller controls for Res and Drive.
• The cutoff range is 20 Hz to 20000 Hz.
• Resonance ranges from 0.5 to 10.
• Drive ranges from 0 to 1 and boosts the level hitting the filter core.

Inputs And Outputs#

Port	Type	What It Does
In	Audio	Source signal sent into the filter.
Cut	CV	Modulates cutoff frequency.
Res	CV	Modulates resonance.
Drive	CV	Modulates input drive amount.
Out	Audio	Filtered highpass output.

Controls Reference#

Control	Range	Default	Behavior
Cutoff	20..20000 Hz	1000 Hz	Sets the highpass cutoff point.
Res	0.5..10	1	Sets resonance intensity.
Drive	0..1	0	Raises the input gain before the filter stage.

CV Behavior#

• Cut uses exponential modulation.
• Res applies linear modulation and is clamped to the module range.
• Drive is a positive amount control; the panel labels its CV lane as 0V~+5V.
• The DSP smooths parameter motion so quick sweeps stay usable.

Character Notes#

• This module is meant to cut body and weight, not preserve it.
• Raising Drive changes the tone before the highpass stage, not just the final level.
• Pairing it with MS-20 LPF gives the familiar dual-filter workflow associated with that family.

Panel Layout#

• The large center knob is Cutoff.
• The smaller left knob is labeled PEAK, which corresponds to Res.
• The smaller right knob is Drive.
• The three CV inputs sit above the audio jacks, with SIGNAL IN and SIGNAL OUT at the bottom.