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MANUAL — Opens this manual.
HN-6 Harmonic Notch
Clean Resonance Control.
Harmonic notch processor · 6 bands × 5 harmonics · Mono / Stereo / 5.1 · VST3 · AU · Standalone
HN-6 removes resonances, hum and ring at the root. Each of its six bands plants a surgical notch on a fundamental and repeats it up the series automatically — octaves (f·1,2,4,8,16) or true harmonics (f·1,2,3,4,5) — with the depth of each next step set by MASTER DECAY. The doctrine is narrow and honest: the fundamental takes the full cut, the partials progressively less, and the timbre survives. Six problems, six knobs, thirty notches.
HN-6 face. The numbers below refer to this view.
Top panel
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DISPLAY — Log frequency response, 20 Hz–20 kHz, +6…−42 dB. Colored curves = each band’s notch series; the cream curve = the total response; the filled trace behind is the live input spectrum. The nodes are hands-on: drag a numbered node to set FREQ and CUT, mouse wheel = Q, Shift+wheel = MASTER DECAY, double-click a node = band on/off. The chip shows the selected band’s exact numbers. “analyzer idle — press INPUT to go live” appears while no audio runs.
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OUTPUT — Master trim, −24…+12 dB. Double-click any value on the face to type it exactly (“2.4k” style accepted for frequencies).
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ON — Processing engaged.
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BYPASS — Full bypass; the total curve dims while bypassed.
I/O row
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INPUT — Standalone only: pick the input device and press INPUT to go live.
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MONITOR — Standalone only: routes the processed signal to the monitor output.
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STATUS — Insert mode and state (e.g. “stereo insert · running”).
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ANALYZER — Cycles FFT (filled spectrum) → 64 BAND (bars with peak-hold) → ANA OFF.
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FFT SIZE — 2048 / 4096 / 8192 — analyzer resolution versus speed.
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SERIES — OCTAVE: notches at f·1, 2, 4, 8, 16 — hum and its octaves, room modes. HARMONIC: f·1, 2, 3, 4, 5 — the true overtone family of a ringing note or buzz.
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WIDTH — CONST Hz: Q scales with each multiple so every notch keeps the same bandwidth in hertz — surgical up top. PROP Q: the same Q everywhere, bandwidth grows with frequency — gentler, more musical.
Model row
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MODEL — MONO / STEREO / 5.1 — channel configuration; one process is applied across the model’s channels.
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INSERT PATCH — The rack-side patch points this unit occupies (with RP-1, e.g. INS A · CH 15 / INS B · CH 16). Read-out, set by the rack.
Bands
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BAND · LED — Click the band header to switch it on/off. LED and curve carry the band color.
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FREQ — The fundamental, 20 Hz–20 kHz (log). Type exact values by double-clicking the readout.
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CUT — Depth at the fundamental, 0…−40 dB. Each upper step gets CUT × DECAYᵏ.
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Q — 0.5–100. Stay narrow: start at Q 30–40 and deepen rather than widen — a neighbor problem gets its own band, not a wider notch.
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MASTER DECAY — ×0.05…×1.00 — how much of the cut each next harmonic inherits (harmonic slope link). ×0.50 halves the depth per step; ×1.00 repeats it at full strength.
Quick start
- Switch band 1 on and drag its node onto the offending fundamental — or double-click the readout and type it.
- SERIES: OCTAVE for hum and room modes; HARMONIC for a ringing note’s overtone family.
- Cut deep at the fundamental and let MASTER DECAY (~×0.50) taper the series.
- WIDTH CONST Hz keeps the upper notches surgical. Keep Q high; never widen — add another band instead.
- Watch the ANALYZER, A/B with BYPASS, and touch OUTPUT only if you removed real energy.
HN-6 Harmonic Notch · © 2026 Yilmaz Yeniyol. All rights reserved.