Wow Control

Wow, flutter, tape

Meet Wow Control: an audio plugin entirely focused on the weird & wild ~modulations~ of analog tape and other less-than-perfect analog playback devices. In developing Wow Control, we set out to accurately capture the essence of three tape machines spanning three decades: every noise, every wobble, & every harmonic. The plugin that has resulted is the most comprehensive analog tape model we’ve ever heard.

Wow Control expands and improves upon the wow & flutter section from the classic Vulf Compressor — bringing more expressive shape controls, beat-syncing, and an extensive randomization section for creating complex and unpredictable modulation effects. At its extreme settings, it will bend and distort anything that it touches. Used gently, however, it can breathe a little life or movement into individual mix elements or bring color and richness to an entire master.

You can keep your trusty 424 around if you want, but you no longer need to if you own a copy of Wow Control.

Interface Preview

Here’s a screenshot of Wow Control in action. Click anywhere on the interface to jump to a control’s definition below.

Advanced Controls


Turntables & Tape Machines

Anyone who’s put on a warped record has heard their music bend and wobble as it moves unevenly under the stylus. Similarly, if a tape player reel, capstan, or pinch-roller doesn’t spin smoothly (or isn’t perfectly round) the tape will speed up and slow down under the repro head. The speed of this movement directly correlates with the pitch of the audio: moving the media too quickly sounds high pitched, while moving it too slowly sounds low pitched. These continuous pitch changes, exhibited by all turntables and tape machines (to some degree), are called wow & flutter.

What Are Wow & Flutter Specifically?

Wow & flutter are repeating, gradual pitch shifts where the wow repeats slowly and the flutter repeats more quickly. Together, they create a wobbly feel that is more expressive and less mechanical than traditional modulation effects.

How exactly wow & flutter are related is easiest to see by looking at a graph:

Wow & Flutter AloneWow is slow and deep. Flutter is fast and shallow.

Wow & Flutter TogetherTogether, wow & flutter make a more interesting waveform.


Primary Controls


Rate Mode

Determines how the wow speed is set.

Options: Hz, BPM

  • Default Hz


Controls the wow & flutter speed in hertz (Hz).

Speed is active when Rate Mode is set to Hz.

  • Min 0.10Hz
  • Max 20.00Hz
  • Default 0.55Hz


Sets the wow & flutter speed based on musical note durations, ranging from a whole note: 1, to a thirty-second note: 1/32.

Option Symbol

1/2 D

1 T


1/4 D

1/2 T


1/8 D

1/4 T


1/16 D

1/8 T


1/32 D

1/16 T


The Note control supports clicking, dragging, and the arrow keys. Use Shift + or to “lock” the current row when changing notes.

Note, BPM, and Tempo Sync are all active when Rate Mode is set to BPM.

  • Min 1
  • Max 1/32
  • Default 1/4


Wow Control’s tempo in beats per minute (BPM).

BPM can be set via tap tempo. Use the T key when the control is highlighted to tap in your desired tempo.

  • Min 30.0
  • Max 300.0
  • Default 120.0

Tempo Sync

Determines how the tempo (BPM) is set: either manually or synced from the host/DAW.

Options: Manual, Synced

  • Default Synced



Adjusts the depth of the wow & flutter modulation.

0% is no modulation

100% is maximum modulation.

The maximum depth is set by Amount Multiplier.

  • Min 0%
  • Max 100%
  • Default 15%

Amount Multiplier

Scales the range of Amount by a multiple.

  • Min 1x
  • Max 256x
  • Default 1x


Blends the pitch modulation shape between square, sine, and triangle shapes.

  • Min 0%
  • Max 100%
  • Default 0%


Controls the blend of the wow & flutter signal with the dry, uneffected signal.

0% is all dry signal. 100% is all wow & flutter signal. 50% is an equal blend of the dry and the wow & flutter signals that produces interesting phasing and comb-filtering effects.

  • Min 0%
  • Max 100%
  • Default 100%


Analog On/Off

Turns On or Off Wow Control’s Analog section.

  • Default On

Analog Color

Controls the amount of analog-modeled coloration of the frequency spectrum.

At 0%, the frequency response is perfectly flat. At 100%, the frequency response matches the real-world response of the modeled tape machine. At settings above 100%, the response is intensified, and the analog model exhibits slightly higher noise levels.

  • Min 0%
  • Max 200%
  • Default 100%

Analog Saturation

Controls the amount of analog-modeled saturation.

At 0%, no distortion or saturation occurs. At 100%, the distortion matches the real-world response of the modeled tape machine. At settings above 100%, the distortion is greatly intensified.

Analog Saturation includes a level meter embedded in the slider. This meter shows the peak level of the signal after the Color and Saturation have been applied.

If the signal peak exceeds or equals 0.0dB the meter color turns darker red, indicating that clipping could occur. Wow Control will never clip internally, due to its double-precision floating-point processing, but the signal might be clipped at a later stage (by the host/DAW or DAC).

  • Min 0%
  • Max 200%
  • Default 100%

Analog Mode

Selects the analog tape model used for the entire Analog section.

Option Discussion
15 IPS

Reel-to-reel machine running at 15 inches per second (ips). The most “hi-fi” Analog Mode in Wow Control. Strong 3rd-order harmonics and a beefy low end.

7.5 IPS

Reel-to-reel machine running at 7.5 inches per second (ips). Strong 3rd and 2nd-order harmonics and a rounder sound.


4-track cassette machine running at 1⅞ inches per second (ips). Significant saturation with strong 3rd-order harmonics, particularly in the low end.

At their default settings, each Analog Mode produces some noise. To adjust the noise level, use the advanced Analog Noise Gain control.

Tape Model Specifications

Type Freq. Response SNR (A-Weighted)
15 Inches-Per-Second 20Hz – 20kHz (±3dB) -68 dB
7.5 Inches-Per-Second 18Hz – 13kHz (±3dB) -67 dB
Cassette 24Hz – 10 kHz (±3dB) -61 dB
  • Default 15 IPS

Master On/Off

Bypasses Wow Control’s processing.

We recommend using the Master On/Off instead of your DAW’s plugin bypass to avoid digital artifacts.

  • Default On

Advanced Controls

The Advanced section offers more precise control and fine adjustment options.

To access Wow Control’s advanced controls, click the ••• icon in the sidebar.


Input Gain

Controls the input gain before it hits Wow Control’s processing.

Input Gain includes a level meter embedded in the slider. This meter shows the peak level of the signal before it hits Wow Control’s processing.

If the signal peak exceeds or equals 0.0dB the meter color turns darker red, indicating that clipping could occur. Wow Control will never clip internally, due to its double-precision floating-point processing, but the signal might be clipped at a later stage (by the host/DAW or DAC).

  • Min -24.0dB
  • Max 12.0dB
  • Default 0.0dB

Output Gain

Controls the output gain after Wow Control’s processing.

Output Gain includes a level meter embedded in the slider. This meter shows the peak level of the signal after Wow Control’s processing.

If the signal peak exceeds or equals 0.0dB the meter color turns darker red, indicating that clipping could occur. Wow Control will never clip internally, due to its double-precision floating-point processing, but the signal might be clipped at a later stage (by the host/DAW or DAC).

  • Min -24.0dB
  • Max 12.0dB
  • Default 0.0dB


Stereo Phase

Alters the stereo phase of the wow & flutter modulation.

  • At , each channel’s modulation is exactly the same.
  • At 180°, the modulation is completely out of phase. This produces a wider stereo image and interesting doubling effects.
  • Min
  • Max 360°
  • Default

Phase Offset

The Phase Offset makes it possible to offset where the pitch modulation shape occurs in time (generally most useful when Wow Control is synced to the beat).

By default, the downbeat aligns with the start of downward modulation. This means that moments of zero delay will occur on downbeats.

  • Min
  • Max 360°
  • Default

Wet Delay

Wet Delay controls the overall delay of the wow & flutter signal.

Automate it for entirely custom pitch shifting, or combine with Wet/Dry to create flanging effects or echoes.

  • Min 0ms
  • Max 500ms
  • Default 0ms

Flutter Amount

Varies the amount of flutter in the pitch modulation.

  • 0% results in long, smooth wow modulation.
  • 100% brings the flutter up to max for a quickly changing, wobbly sound.
  • Min 0%
  • Max 100%
  • Default 50%

Analog Noise Gain

Controls the gain of the analog noise.

At 0 dB, the analog noise level matches that of the modeled real-world analog device.

Though it might seem wise to always turn Off the analog noise, we recommend leaving it On as much as possible and instead turning it down as needed. Unlike some tape plugins, Wow Control’s noise is not simply added white noise. As with a real tape machine, the noise is also affected and modulated by the signal and will have a significant impact on the distortion and overall sound.

You can quickly turn toggle the analog noise On or Off by clicking the small sidebar “noise” icon.

  • Min -96.0dB
  • Max 24.0dB
  • Default -6.0dB


The Random section allows many of Wow Control’s controls to be moved randomly over time. This helps add more variability and unpredictability to the wow & flutter modulation.

Random Mode

Selects which control(s) should be randomized.

Option Discussion

Turns the randomization off


Modulates the Speed parameter


Modulates the Amount parameter


Modulates the Shape parameter

Stereo Phase

Modulates the Stereo Phase parameter (only in stereo)

Phase Offset

Modulates the Phase Offset parameter

Amount + Speed

Modulates both the Amount and Speed parameters simultaneously

Wet Delay

Modulates the Wet Delay parameter

  • Default Off

Random Speed

Controls how fast the random values are chosen.

  • Min 0.10Hz
  • Max 10.00Hz
  • Default 1.00Hz

Random Amount

Controls how far the random values can stray from the actual control’s value.

Example: if Random Mode is set to 100%, the random values will fluctuate between ±50% of the actual control’s value.

  • Min 0%
  • Max 200%
  • Default 100%

Random Smoothing

Controls how smoothly the random values move from one to another.

200% produces the smoothest sounding randomization, whereas 25% will yield fast, jumpy control movements.

  • Min 25%
  • Max 200%
  • Default 100%

Random Seed

Controls the “seed” of the randomization engine. If set to 0 (aka “Off”), there is no seed.

This control won’t really change the sound of Wow Control; instead, it’ll change the pattern used for randomization. If you’re looking to get the same randomization pattern every time, set this control to any non-zero value. This makes it possible to synchronize multiple instances of Wow Control and get the same results each time you bounce/export a project.

For repeatable bounce/export results, you must bounce from the same time location each time.

  • Min 0
  • Max 9999
  • Default 0

HQ Mode

HQ Mode is our no-holds-barred processing mode where super high quality audio is given priority over CPU usage.

When HQ Mode is turned On, Wow Control uses a higher precision algorithm, providing better spectral resolution at the expense of some added latency (~50 ms) and higher CPU usage.

We recommend using HQ Mode when you need the highest possible quality and don’t mind 2-4x higher CPU usage. An important lead instrument, vocal, or a mastering session is a great place for HQ Mode.

HQ Mode will require more CPU resources and result in a slightly higher processing delay (latency). To ensure proper delay compensation in your host/DAW, automating HQ Mode is not recommended.

  • Default Off


Supported Channel Configurations

Input Channel # Output Channel #
1 1
1 2
2 2


Alexander Bersen / Annlie Huang / Chris Conover / Connor B. Fitz / Diana Zheng / Drew Yeaton / Jack Stratton / Mark Schleunes / TaeHo Park / Theo Katzman / Tyler Duncan


Devin Kerr / Rob Stenson / Jasper Duba / Noah Dayan / Emma Azelborn


TaeHo Park / Tiago Frúgoli / Gustavo Guzmán / Reda Kermach / Noah Dayan / Gal Cohen / Sydney Bolton / Enrico Cirene

About Goodhertz Plugins

User Interface

Goodhertz plugins are made to be workhorse tools that sound amazing. We’ve put a lot of thought and care into the audio quality and plugin usability, and for that reason, we’ve opted for simple and direct controls & interfaces that don’t rely on photorealistic knobs or ornamental screw heads to communicate their meaning.

We’ve also decided to only include meters and graphs when we feel they will directly lead to a better sonic result. Meters/graphs can consume significant CPU resources, and we firmly believe that if it sounds good, it is good.

Our meters can be reset at any time using the “Reset Meters” button (in certain plugins) and manually enabled or disabled via the “Enable Metering” User Preference.

Preset Bar

Button Action
Undo the last parameter change.
Redo the last parameter change.
Switch to the previous preset.
“Preset Name” Opens the preset drawer (Option/Alt + Click to reset all plugin settings to preset).
Switch to the next preset.
Selects the A settings state.
This copies the current settings to the opposite A/B state; i.e. if you’re on the A state, clicking the arrow will copy those settings to the B state.
Selects the B settings state.


Introduced in version 3.10, the toolbar at the bottom of the plugin holds a handful of shortcut buttons.

Icon Action
Opens preferences menu
Shows diagnostic information
Opens plugin manual in your default web browser
Opens a URL representation of the current plugin control state (Command/Ctrl + Click to copy the URL to the clipboard)
Opens language-selection menu
Shrink interface
Enlarge interface

Keyboard Shortcuts

Action Keyboard Shortcut
Enter New Parameter Value Once you’ve tapped or double-tapped a control, type in a value, then hit Enter, Return, or Tab
Increment Parameter Value or arrow keys
Decrement Parameter Value or arrow keys
Jump to Next Parameter Tab
Jump to Previous Parameter Shift + Tab or ` (backtick)
Escape Parameter Focus / Close any Open Drawers Esc
Tap Tempo t (N.B. For this to work, you must have a BPM control selected.)
Save Preset n (N.B. For this to work, the preset panel must be open.)
Set Preset as Favorite f (N.B. For this to work, the preset panel must be open.)
Edit Preset e (N.B. For this to work, the preset panel must be open.)
Update Preset u (N.B. For this to work, the preset panel must be open.)
Delete Preset Delete (N.B. For this to work, the preset panel must be open.)

Right-Click Actions

Action Instruction
Read about Control in manual Right-Click & select “Show in Plugin Manual”
Reset Control to Default Right-Click & select “Reset to Factory Default Value”
Lock Control when switching presets Right-Click & select “Lock When Switching Presets”
Copy current plugin settings to clipboard Right-Click & select “Copy as URL to Clipboard”
Paste all plugin settings from clipboard Right-Click & select “Paste From Clipboard”
Reset all plugin settings to Defaults Right-Click & select “Reset to Factory Defaults”
Reset all plugin metering Right-Click & select “Reset Meters” (only available in certain plugins)
Reset all plugin settings to Preset Right-Click & select “Reset to [preset] Preset”
Update Preset with current plugin settings Right-Click & select “Update [preset] Preset”
Create new Preset with current plugin settings Right-Click & select “Create New Preset”
Go to the plugin’s manual page Right-Click & select “Read [plugin name] Manual”

Right-Click Preferences

Action Explanation
Language Switch the display language of text elements in Goodhertz plugins. We currently support the following languages: English, Spanish, Portuguese, French, Italian, Japanese, Korean, Chinese (Simplified), Chinese (Traditional), and Arabic.
Always Open Advanced Pane By default, this is Off — i.e. when the plugins open, they do not show you the advanced controls available by hitting the ••• button in the sidebar. If you’d like to always see the advanced controls, enable this preference.
Control Granularity By default, all Goodhertz controls move in small increments when dragged. If you prefer controls to operate with larger increments by default, change this option to Coarse. N.B. This will swap the behavior of the Shift mouse modifier - i.e. Shift-dragging will move a control with standard granularity when set to Coarse.
Dark Mode Allows you to choose the color palette used for displaying the interface. If you prefer the look of dark colors (or work in a darker environment) enable this option. The Auto option will automatically adjust the color scheme depending on the system preferences of your machine (Mac only).
Enable Hover Markers By default, this is On — i.e. all controls will show markers on hover. If you find this behavior unnecessary, deselect this option and no markers will be shown.
Enable Metering By default, this is On — i.e. in normal operation, all audio meters and visualizations available in Goodhertz plugins are enabled and running. If you’d like to turn them off and disable all metering and visualization, deselect this option. And to turn them back on, simply reselect it. N.B. If you’re struggling to use a large number of Goodhertz plugins on an older processor with an integrated GPU, sometimes disabling metering can help.
Enable Scroll Input By default, all Goodhertz sliders can be scrolled in addition to dragged. If you find this behavior unnecessary, deselect this option and no scrolling events will be used to control Goodhertz sliders.
Enable Tooltips By default, this is On — i.e. all controls will show a tooltip on hover. If you find this behavior unnecessary, deselect this option and no tooltips will be shown.
GPU Acceleration By default, this is Enabled — i.e. the GPU will be prioritized whenever possible to improve graphics performance. If your graphics card does not support GPU acceleration, this preference will be automatically set to Reduced. N.B. If you experience graphics issues, disabling this preference may help.
Keyboard Focus By default, you can get keyboard focus on any Goodhertz control with a single click. Change this option to ensure keyboard focus only occurs on double clicks.
Window Size Enlarge or shrink the Goodhertz plugin window by selecting an option here. This will save your preference for all instances of this plugin.
Diagnostics Displays general information about the plugin and the configuration of your system for diagnostic purposes. If you experience any issues with the plugin, it can be helpful to include this information when contacting us. N.B. Clicking this window will copy the contents to the clipboard.

Mouse Modifiers

Action Combination (Mac) Combination (Windows)
Reset Parameter to Default Value Option + Click Alt + Click
Move Control with Coarse Precision Shift + Drag Shift + Drag
Move Control with Fine Precision Command + Drag Ctrl + Drag
Move Control with Normal Precision Drag Drag


Unintentional digital clicks and pops are the worst. They happen for lots of reasons and often end up wasting your time with needless revisions or mastering surgery. When they go unnoticed, they can make their way onto commercial albums and releases.

Plugin automation is a common cause of clicks and pops. Sweeping an EQ band, changing a delay setting, and even automating a plugin bypass can cause digital artifacts if poorly handled.

This is not true for Goodhertz plugins. Any parameter in a Goodhertz plugin, even on/off switches, can be automated freely and smoothly without clicks, pops, or zipper noises (unless otherwise noted). You can push them, pull them, LFO them — whatever you do, they’ll handle it gracefully.

Since our Master On/Off controls won’t create artifacts, we recommend that you use them rather than your DAW-supplied plugin bypass if you want to disable plugin processing.

Plugin Settings

Goodhertz plugin settings can be copied and pasted as text urls, which look like this:

To copy and paste, right click anywhere on the plugin interface and select either the copy or the paste option.

E.g. If you paste “” into Vulf Compressor it will recall the settings associated with that url. This way you can easily send an exact plugin setting to someone — in an email or even a tweet — without any guesswork or screenshots.”

System Requirements

Mac OS X ≥ 10.13

Audio Unit 64-Bit, VST 64-Bit, VST3 64-Bit, or AAX 64-Bit host

Windows ≥ 10

VST 64-Bit, VST3 64-Bit, or AAX 64-Bit host

Contact Support

To send plugin feedback, please e-mail us at

If you have a quick question, send us a tweet @Goodhertz. We’re often able to respond faster to tweets than emails.

If you’re having trouble, experiencing a technical issue, or you think you’ve found a bug, please email

Find all our contact info & bug-reporting protocol on the contact page.