Audio Filter Equalizer

Multi-band equalizer with up to 64 bands. Each band can independently be one of 8 filter types: low pass, high pass, band pass, notch, low shelf, high shelf, peaking (Cook biquad), or plateau (cascaded Butterworth shelving). All band parameters are also exposed as arrays for programmatic control.

The equalizer combines the precision of a parametric EQ with the flat-topped shaping of a plateau EQ. Standard filter types (low pass through peaking) use Cook/RBJ biquad coefficients. The plateau type creates a flat boost or cut between two frequencies using cascaded Butterworth shelving filters with independent slope orders (1-16) on each side. This makes it possible to mix surgical EQ bands with broadband plateau shaping in a single module.

Creation query

When inserting the module, a dialog asks for the number of bands (1 to 64, default 4). This determines how many independent EQ bands are available. The number of bands is fixed after creation.

Settings

bypass

Bypasses the module processing when activated (ON).

• OFF (0): Module processes normally
• ON (1): Input passes directly to output without processing

in

Audio input flow(s).

out

Audio output flow(s).

Array ports

All array ports have a length equal to the number of bands. They provide bidirectional synchronization: changing a band control updates the corresponding array element, and writing to an array updates all corresponding band controls.

array type

Filter type for each band as an integer array. Values correspond to:

• 0: low pass
• 1: high pass
• 2: band pass
• 3: notch
• 4: low shelf
• 5: high shelf
• 6: peaking
• 7: plateau

array on

Band on/off state as an integer array (0 = off, 1 = on).

array gain

Gain of each band in dB as a float array.

array Q

Q factor of each band as a float array. Range depends on filter type:

• peaking: 0.3 to 128
• other standard types: 0.3 to 1.0
• plateau: not used (ignored)

array order low

Butterworth order for the low-frequency (up) slope of each band, as an integer array. Only used when the band type is plateau.

array order high

Butterworth order for the high-frequency (down) slope of each band, as an integer array. Only used when the band type is plateau.

array freq low

Frequency of each band in Hz as a float array. For standard types (low pass through peaking) this is the center/cutoff frequency. For plateau type, this is the low cutoff frequency.

array freq high

High cutoff frequency of each band in Hz as a float array. Only meaningful for the plateau type; ignored for other types.

array color

Display color of each band as a color array. Controls the color of the selector dot and the per-band EQ curve in the visual panel.

Per-band controls

Each band has its own set of controls, numbered from 1 to N (the number of bands). The controls that are relevant depend on the selected filter type.

on

Activates or deactivates the band. When off, the band has no effect on the audio signal. Double-clicking a selector in the visual panel also toggles this.

type

Filter type for this band:

• low pass -- attenuates frequencies above the cutoff
• high pass -- attenuates frequencies below the cutoff
• band pass -- passes a frequency band and attenuates outside it
• notch -- removes a narrow frequency band
• low shelf -- boosts or cuts below the cutoff frequency
• high shelf -- boosts or cuts above the cutoff frequency
• peaking -- boosts or cuts around the center frequency with adjustable Q (default)
• plateau -- flat-topped boost or cut between two frequencies with independent Butterworth slopes

When the type changes, the relevant controls are automatically shown or hidden:

• Standard types (0-6): frequency, gain, and Q are active. Order and frequency high are hidden.
• Plateau (7): frequency (low cutoff), frequency high (high cutoff), gain, order low, and order high are active. Q is hidden.

gain

Amount of boost (positive) or cut (negative) in dB. The range is determined by the gain max setting (default +/- 24 dB, maximum +/- 48 dB).

For plateau type, the gain applies to the flat-topped region between the two cutoff frequencies.

frequency

Center frequency (for standard types) or low cutoff frequency (for plateau). Default values are logarithmically distributed across the spectrum based on the band number.

frequency high

High cutoff frequency for the plateau type, in Hz. Only visible when the band type is plateau.

The high frequency must be greater than the low frequency. If frequency is dragged above frequency high, frequency high is automatically adjusted.

Q

Q factor / bandwidth for standard filter types. Higher Q means a narrower, more resonant filter curve:

• peaking: range 0.3 to 128, logarithmic scale.
• other standard types: range 0.3 to 1.0.

Adjustable with the mouse wheel when hovering over the band's selector in the visual panel. Not used for plateau type.

order low

Butterworth filter order for the low-frequency (up) slope of a plateau band:

• 1: gentle slope (6 dB/octave)
• 2: moderate slope (12 dB/octave) -- default
• 4: steep slope (24 dB/octave)
• 8: very steep slope (48 dB/octave)
• 16: maximum steepness (96 dB/octave)

Adjustable with the mouse wheel (on the low selector) when the band type is plateau. Only visible for plateau type.

order high

Butterworth filter order for the high-frequency (down) slope of a plateau band. Same scale as order low. Adjustable with the mouse wheel on the high selector. Only visible for plateau type.

Higher orders give a more rectangular plateau shape but use more CPU. Having independent orders allows asymmetric plateau shapes (e.g. gentle low slope + steep high slope).

color

Display color for this band in the visual panel. Each band gets a unique default color. Affects the selector dot and the per-band EQ curve.

Other controls

last clicked index

Outputs the index (0-based) of the last band whose selector was clicked or double-clicked in the visual panel. Returns -1 if no band is selected. Output only.

plot bins

Array which contains the values of the plotted points.

bins size

Number of points used to draw the equalization curve.

calc plot bins if invisible

If enabled, the module calculates the filter plot bin's even if it's invisible.

bins size

Number of frequency bins used to compute the EQ response curve for the visual panel. Higher values give a smoother curve but use more CPU.

reset

Resets all the values of the selected object.

saved in preset

Determines if parameters of this object are saved in the preset-panel.

fade preset

Parameters of the this object can cross faded when you recall a preset in the grid.

Settings

gain max

Maximum allowed gain value in dB (1 to 48). Changing this value rescales all band gain ranges to +/- the new value.

calc plot bins if invisible

When enabled, the EQ response curve is recalculated even when the visual panel is not visible. Enable this if you need the plot bins output array to be continuously updated (e.g. for driving an external visualizer).

Visual panel

The module includes an interactive frequency response display panel. It shows:

• The combined EQ curve (sum of all active bands) as a white line
• Individual per-band curves in each band's color
• Selector dots for each band, positioned at the band's frequency and gain

For standard filter types (low pass through peaking), each band has one selector (at the center frequency). For plateau type, each band has two selectors: one at the low cutoff and one at the high cutoff, both at the half-gain level.

The horizontal axis uses a logarithmic frequency scale (20 Hz to 20 kHz). The vertical axis is linear gain centered at 0 dB.

Mouse interactions on the visual panel

Action	Effect
Click + drag a selector	Move frequency and gain simultaneously
Shift + drag	Adjust gain only (frequency is locked)
Double-click a selector	Toggle the band on/off
Mouse wheel on a selector	Adjust Q (standard types) or order (plateau type). For plateau, the low selector adjusts order low, the high selector adjusts order high

caption

Displayed caption of the object. Click to enter a new name.

reset

Resets all the values of the selected object.

Other Settings

hint

Hint text displayed on mouse over.

background

background color

Background color of the control.

Blue background color example.

transparent

Determines if the background of the control is transparent or not.

Example, the first module is transparent.

remote highlight color

Background color when the control is modified by a remote (MIDI,OSC,etc.).

image file

Optional Filename of the background image.

Example on an panel-xy-pad.

image fit mode

Force the image file to adapt its displayed size to the size of the object.

• proportional: the image keeps its proportion ratio and is left aligned,
• scaled: the image is scaled to the object size,
• original: keeps the original size
• clipped: the image is clipped to the object size, and centered,
• scaled: the image is scaled to the object size taking into account the border-size of the control.

svg filename

Name of the svg file to draw in background.

svg fill color

Color used to fill the svg.

svg stroke color

Color used to draw the contour of the svg.

svg stroke width

Width of the stroke used to draw the contour.

svg margin

Margin used to draw the svg file.

svg keep aspect ratio

When the svg is stretched to the destination size, determines if it keeps its aspect ratio or is stretch to fit to the target rectangle.

border

show border

Displays or not the border of the control.

8 pixels border on an panel-xy-pad.

border width

Sets the border width of the control in pixel.

8 pixels border on an panel-xy-pad.

border color

Border color of the control.

a yellow border on an panel-xy-pad.

border OFF color

Border color when the control is OFF.

a black OFF border on a switch.

border ON color

Border color when the control is ON.

a white ON border on a switch.

round size

Thickness of rounded corners.

Example on a panel-shape.

don't draw selection border

Enables or disables the drawing of a border when the control is selected with the mouse.

caption

show caption

Displays or not the caption.

Example on a fader.

caption horizontal align

Caption alignment of the control, left, center or right.

caption vertical align

Vertical alignment of the caption, center, top or bottom.

Example on knob: Center, top and bottom.

Example on switch.

caption font size factor

Size multiplication factor applied to the caption font.

Example on switch.

caption font

Font name of the control caption.

Example with 3 different fonts on switch.

caption font color

Color of the caption font.

Example on switch.

caption font italic

Italic style for caption font.

Example on switch.

caption font bold

Bold style for caption font.

Example on switch.

caption font underline

Underline style for the caption font.

Example on switch.

frames

frames count

Number of frames in the background bitmap. See create your own knobs and faders.

frames alignment

Determines if the frames used in the background bitmap are aligned vertically or horizontally. See create your own knobs and faders.

global

mouse editing enabled

Determines if the control can be modified by the user. When OFF, the mouse interaction and modifications are disabled so the user can't change the value.

receive mouse info

When ON, the control receives mouse information (often called hit-test). This is useful when you want to detect mouse interactions on overlapping controls. Only the top control with receive mouse info ON will get the mouse events.

is visible

Sets or get the visibility of the control.

global color

Global color of the control. Usine will choose the best contrasted colors according the global color.

ignored in parent global color

When ON the global color of the control is not affected (is isolated) when the parent control global color changes.

design template name

Name of the snapshot (which contains the visual properties) loaded when the object is created. By default the snapshots files are located in /Resources/Templates/Design or /Config/Templates/Design.

z order

Determines the Z-order of the control

• normal: the Z-order is the control creation order
• front: the control appears always on top of all other controls
• back: the control appears always behind all other controls

Example with the first knob on top.

opacity

Opacity value of the control.

blur softness

Blur amount applied to the object.

Example of blur.

location

display location

Determines where the object is visible.

• invisible: the object is invisible.
• ctrl panel: in the control-panel.
• parent ctrl panel: in the control-panel of the parent patch if it exists.
• top ctrl panel : in the control-panel of the top parent patch (main patch) if it exists.
• container : in the container of the current patch.
• parent container : in the container of the parent patch of the current patch.
• top parent container: in the container of the top parent patch of the current patch.
• pop up window: visible in the popup.
• top header: visible in the top top-header-panel.
• toolbox: visible in the toolbox-panel.
• workspace: visible in the workspace-panel.
• additional container: visible in an additional container, identified by a number. See bellow.

additional container

Sets the control as an additional container so any other control can be placed into that container. The additional container is identified by a number.

a button inside a listbox

also visible in interface builder

When ON, will also be visible in the interface-builder-panel.

mouse tab settings

Settings related to mouse, touch screen and drag&drop.

mouse & gesture

mouse dwn

Gives the mouse state of the control:

• 1 if the mouse is pressed
• 0 otherwise.

mouse wheel

Gives the mouse wheel speed and direction, -1,-2,-3,...=forward, 1,2,3,...=backward.

mouse wheel enabled

Enables or disable the mouse wheel action.

dbl click

Sends a 1 value if the user has [dbl-clicked] on the control.

mouse active

Determines if the mouse is active on the control.

mouse x

Gives the mouse X position on the control in relative coordinates from 0=most-left to 1=most-right.

mouse y

Gives the mouse Y position on the control in relative coordinates form 0=top to 1=bottom.

bitmap

bitmap in

Background bitmap input.

bitmap out

Background bitmap output.

touch pressure

Pressure value on touch-screens.

gesture

Gesture information.

reset

auto reset

When ON, the value of the control is reset automatically on mouse up.

drag & drop

drag enabled

Enables the drag on this control.

allow drop

Enables or disables the drag&drop possibilities on this control.

drop file name

Name of the dropped file.

clear drop file name

Clears the latest dropped file name.

vertical mouse

When ON, move up-down to rotate a knob, left-right when OFF.

touch screen

touch hi precision

Mode of the precision factor. Can be disabled or for touch screen only or always (touch screen and mouse).

precision factor

Precision factor when the control is modified with a touch screen. Hi values for hi precision on touch screen.

mouse mode

Behavior of the control when it is modified with a touch screen.

circular mouse

When ON, the mouse wheel acts in circular mode.

keyboard arrows

keyboard arrows enabled

Determines if the control can be modified with the [arrow] keys of the keyboard.

focus & cursor

mouse over

Sends a 1 value when the control is hovered with the mouse.

mouse cursor

Determines the type of mouse cursor for the control.

• default
• none
• arrow
• cross
• beam
• size NESW
• size NS
• size NWSE
• size WE
• up arrow
• hour glass
• drag
• no drop
• H split
• V split
• multi drag
• SQL wait
• no
• app start
• help
• hand point
• size all

  selection

  selected

  Sends 1 when the control is selected.

remote tab settings

Settings related to remote control assignation and learn.

general

clear all learn

Clear all the remotes assignations.

remote active

Enables or disables the remotes assignations.

inverse

Inverse the values received during the learn.

quantize

Quantization applied when state or value changes.

• no quantization,
• cycle,
• Bar,
• beat,
• 1/8,
• 1/16.

active mode

Determines when the remote assignations are active.

• always
• if rack is ON
• if rack is selected
• if patch is ON
• if patch is selected

bind buses

clear bind bus

Clear the current bind assignation.

binding

Set or get the bind name assignation.

bind controls

bind ID

ID of the bind control.

bind caption

Caption of the bind control.

clear bind control

Clear the current bind control assignation.

MIDI

start midi learn

Click on this button and move your MIDI controller to assign it.

device name

Name of the device associated to the MIDI learn.

channel

MIDI channel used for the MIDI learn.

control num

MIDI Control message number (ie. Control Change, Note, etc) used for MIDI learn.

control type

MIDI message type used for the MIDI learn.

• None,
• NOTE OFF,
• NOTE ON,
• POLY AFTERTOUCH,
• CONTROL CHANGE,
• PROGRAM CHANGE,
• CHANNEL AFTER TOUCH,
• PITCH BEND.

midi mode

Choose between the 3 MIDI assignation modes in Usine.

• Absolute The controller sends a MIDI message with a value between 0 and 127 (typically rotary knob, fader). If you create a MIDIlearn NOTE ON on a switch, the value is set to 1 while the key is pressed and set to 0 when released. If you create a keylearn on a switch, the value is set to 1 while the key is pressed and set to 0 when released.
• Relative The controller sends a MIDI message with a positive value when you turn right and negative when left (typically endless knobs)
• Toggle The control toggles its minimum / maximum value each time it receives the learned code. Typically, if you want to assign a MIDI NOTE ON message, to an on/off parameter, for example, start playing a wave file while playing a MIDI keyboard note, you can toggle it on or off, when the same note is played again. On List box or integer faders, the Toggle mode increases the current value until the maximum is reached. Then restarts from the minimum value.

mackie mode

The control react as defined in the Mackie Control protocol. (when the control receives a MIDI message, the MIDI message is sent back to the controller to update its display/leds/fader position).

motorized

Only if you have motorized MIDI controllers connected. Force Usine to send MIDI messages to the connected remote devices and get a MIDI feedback.

soft take over

Soft Take Over if a control is moved on screen and it no longer matches the hardware control, the control will not update until the hardware control matches the onscreen value.

sysex

System exclusive chain used for MIDI learn.

Key

start key learn

Click on this button and press a key (or a key combination ie. [ALT+E]) on your keyboard to assign it.

key

Key used for the key learn. Can be a key combination like [ALT+E], etc.

key mode

Determines how the Key learn affect the control, absolute or toggle.

shortcut

Key code value of the key learn.(ex: A=65)

mapping

mapping curve

Curve type used for the mapping, log or exp, power curve, linear.

mapping curve coeff

Mapping curve coefficient.

mapping range max

Maximum range of the assignation.

mapping range min

Minimum range of the assignation.

OSC

start OSC learn

Click on this button and use a control of your OSC device to assign it.

OSC message

OSC message used for the OSC-learn.

OSC mode

Choose here between 2 modes, real OSC values received or force the values into the [0..1] range.

OSC tag order

This option is utilized to choose which tag to use when receiving multiple values simultaneously like in an XY values.

timecode

time code OFF

Time code learn, used to switch off a switch control.

time code ON

Time code learn, used to trig an action or to switch on a switch control.

VCA

vca

Name(s) of sources VCA's. One control can be controlled by several VCA at the same time so the VCA values are multiplied together.
To enter several names use comma separated string like VCA1,VCA2,VCA3.
See use-vca for more info.

clusters

cluster name

Name(s) of the owner cluster(s). One control can be in many clusters at the same time, but be aware that you could have conflicts (different value sent at the same time).
To enter several names use comma separated string like CLUSTER1,CLUSTER2,CLUSTER3.
See use-clusters for more info.

DMX

DMX universe

Universe number assigned for remote.

DMX channel

Channel number assigned for remote.

size tab settings

settings related to size and position of controls.

orientation

rotation angle

Rotation angle of the control.

is vertical

Rotates this control in vertical position.

zoom

zoom scale

Zoom scale of the control.

can zoom

Determines is the control can be zoomed with the wheel mouse.

Size & positions

top

Top position of the control in pixels.

left

Left position of the control in pixels.

height

Height of the control in pixels.

width

Width of the control in pixels.

percent

position percent x

Horizontal position in % [0..1] relative to the parent panel.

position percent y

Vertical position in % [0..1] relative to the parent panel.

height percent

Height in % [0..1] relative to the parent panel.

width percent

Width in % [0..1] relative to the parent panel.

resize grip

resize grip enabled

Determines if the control can be resized with the resize grip.

Interface Builder position

interface builder top

Top position in pixels in the interface-builder-panel.

interface builder left

Left position in pixels in the interface-builder-panel.

interface builder width

Width in pixels in the interface-builder-panel.

interface builder height

Height in pixels in the interface-builder-panel.

floating panel

floating x

Determines if the control is movable on X axis.

floating y

Determines if the control is movable on Y axis.

floating constrain to parent x

When ON the control stays inside the parent on X axis.

floating constrain to parent y

When ON the control stays inside the parent on Y axis.

resizable panel

resizable left

Determines if the control can be resized on its left hand.

resizable right

Determines if the control can be resized on its right hand.

resizable top

Determines if the control can be resized on its top hand.

resizable bottom

Determines if the control can be resized on its bottom hand.

physics

physics enabled

Enables physics-engine in this panel.

physics speed

The physics speed of the control in physics-engine.

init with random speed

When ON, the physics-engine starts with a random speed for each child controls.

same masses

When ON, all controls have the same masses in the physics-engine.

ignored in physical engine

The position control is not affected by the physics-engine.

friction

Friction factor in the physics-engine.

elasticity

Energy conservation coefficient on collision.

gravity x

Gravity factor on the X axis.

gravity y

Gravity factor on the Y axis.

reset pos x

Position of the object when the physics engine is reset on X axis.

reset pos y

Position of the object when the physics engine is reset on Y axis.

reset positions

Process to reset the position of the control in the physics-engine.

angular speed

Angular speed of the control in the physical engine.

collide

Sends a 1 value when the control collides with another control or a border.

collide info

Gives information about the collide state in the physics-engine.

• 1001: top of the parent,
• 1002: right side of the parent,
• 1003: left side of the parent,
• 1004: bottom of the parent.

speed x

Speed vector value on the X axis in the physics-engine.

speed y

Speed vector value on the Y axis in the physics-engine.

minimize

minimized

Determines if the control is minimized or not.

reorganization

auto reorganize

Automatically reorganize positions of controls in the panel.

reorganize margin

Left margin used in reorganization, in pixels.

reorganize interspace H

Horizontal interspace between controls used in reorganization, in pixels.

reorganize interspace V

Vertical interspace between controls used in reorganization, in pixels.

auto resize options

auto resize

Resizes panels automatically when child controls are moved or resized. Switch it OFF if you use floating panels inside.

auto resize margin

Margin in pixel used for the auto resize option.

force reorganize

Forces the reorganization of controls in the panel.

fit standard size

Adjust the panel width to a multiple of the default rack width.

align to grid

snap to grid

In unlock mode, snap the control to a grid.

grid size

Grid size in pixels when snap to grid is ON.

curve tab settings

Settings related to automation curve recording and playback.

curve

auto record on click

When ON, the automation recording starts automatically when click on the control.

delete curve

Deletes the automation curve.

is playing record

Sends 1 value when the control is playing a recorded automation curve.

header toolbar

show toolbar

Displays the toolbar with its icons.

Example ON and OFF

toolbar size factor

Height of the toolbar % of the global height.

Example toolbar size on a panel.

header

show header

Displays or not the header on the panel.

Example on sequenced-lines.

header height

Height of the header in pixels.

header color

Background color of the header.

solid header color

Determines if the header is drawn as a plain bar (HH5 style) or as small bar in the upper left corner.

plain ON

plain OFF

vertical lock

When ON the control can be modified, with the mouse, only vertically.

Grid

show grid

Displays or not a grid on the panel.

Example with 8 x 4 grid.

grid lines full span

Displays a full grid when ON or just small ticks when OFF on the panel.

Example OFF and ON.

grid color

Color of the grid.

Example with a Yellow grid on a data-generator-sequenced-steps.

horizontal divisions

Number of vertical tick of the grid.

Horizontal division set to 8 on a data-generator-sequenced-steps.

vertical divisions

Number of horizontal tick of the grid.

Example of 4 vertical divisions.

Common Settings

info

show manual

Opens the web browser to display information or help about the selected object, if it exists.

For more details about information/help creation, see create-help-file.

description

Description of the module for internal help purposes only. The description is not displayed in the interface.

ID's

visible only in god mode, see setup-panel-tab-expert.

unique ID

Current private ID for this control used to identify the object.

preset ID

Current private preset ID for this control used for presets.

recreate ID

If you experience difficulties in Polyphonic mode, try to recreate new id(s) with this button.

repair ID s

Each Patch shared on the local network uses its own ID (identification number). If you experience issues of Patches that don't send information to the good target, this button will rebuild all these id's.

Object Remote Address

absolute

Absolute remote address. see objects-address.

local

Local to the current patch remote address. see objects-address.

user addr

User defined remote address. see objects-address.

See also

• FILTER Simple
• FILTER Vocoder
• FILTER Resonator
• FILTER Formant
• Audio Filter Parametric EQ Legacy
• Audio Filter Vocoder Legacy
• Filters
• Audio Filter Waveguide
• Audio Filter Multi Bandpass
• Audio Filter Butterworth
• Audio Filter Oberheim SEM
• Audio Filter Comb
• Audio Filter Formant Morph
• Audio Filter Resonator
• Audio Filter Moog
• Audio Filter DC Blocker
• Audio Filter Biquad
• Audio Filter One Pole
• Audio Filter Equalizer
• Audio Filter Linkwitz Riley
• Audio Filter Vocoder
• Audio Filter Korg MS-20
• Audio Filter Transients
• Audio Filter Steiner
• Audio Filter Simple
• Audio Filter FIR
• Audio Filter Diode Ladder
• Audio Filter Dynamic EQ
• Audio Filter Formant