How Does It Work?#

EQ Eight is an 8-band parametric equalizer with per-band type, frequency, gain, Q, slope, and enable controls, plus dedicated CV for every band's frequency and Q.

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Quick Overview#

• EQ Eight processes one audio input and produces one audio output.
• It has 8 independent bands arranged in series.
• Each band can be enabled or bypassed individually.
• Band types are Low Cut, Low Shelf, Bell, High Shelf, High Cut, and Notch.
• Cut bands support 12 dB/oct, 24 dB/oct, and 48 dB/oct slopes.
• Global controls are Output, Adapt Q, and Scale.

Inputs And Outputs#

Port	Type	What It Does
In	Audio	Source signal for the full EQ chain.
F1..F8	CV	Frequency modulation for bands 1 through 8.
Q1..Q8	CV	Q modulation for bands 1 through 8.
Out	Audio	Final EQ output after all enabled bands and output gain.

Default Band Layout#

Band	Default Type	Default Frequency	Enabled By Default
1	Low Cut	30 Hz	No
2	Bell	80 Hz	No
3	Bell	200 Hz	No
4	Bell	500 Hz	No
5	Bell	1000 Hz	No
6	Bell	2500 Hz	No
7	Bell	6000 Hz	No
8	High Cut	16000 Hz	No

Per-Band Controls#

Control	Range	Default	Behavior
Enabled	Off, On	Off	Inserts or bypasses the band in the cascade.
Type	Low Cut, Low Shelf, Bell, High Shelf, High Cut, Notch	Varies by band	Selects the filter shape for that band.
Freq	20..20000 Hz	Varies by band	Sets the target frequency for the band.
Gain	-24..+24 dB	0 dB	Boosts or cuts shelf and bell bands.
Q	0.1..18	0.707	Sets bandwidth or resonance.
Slope	12, 24, 48 dB/oct	12 dB/oct	Sets the steepness of Low Cut and High Cut bands.

Filter Type Rules#

• Low Shelf, Bell, and High Shelf use the Gain control.
• Low Cut and High Cut use the Slope control.
• Notch uses frequency and Q, but not gain.
• Bands are processed in numeric order from 1 to 8.

Global Controls#

Control	Range	Default	Behavior
Output	-24..+24 dB	0 dB	Applies final gain after the full EQ chain.
Adapt Q	Off, On	Off	Increases effective Q as boost or cut amount grows.
Scale	+/-6 dB, +/-12 dB, +/-24 dB	+/-12 dB	Changes the graph display range only.

CV Routing And Processing#

• F1..F8 use exponential modulation for each band's frequency.
• Q1..Q8 use linear bipolar modulation for each band's Q.
• The DSP cascades the enabled bands, then applies Output gain at the end.
• Adapt Q changes the effective Q used by the DSP; Scale is a visual setting for the display.

Panel Workflow#

• The top of the panel is a frequency-response display for the full EQ curve.
• Below the graph are eight band strips, one for each band, plus a global control section.
• The bottom section holds two CV rows: F1..F8 for frequency and Q1..Q8 for Q.
• Audio In and Out are at the bottom edge of the panel.