Click anywhere on the interface to jump to a control’s definition.

By making your headphones behave a bit more like loudspeakers, the CanOpener Studio crossfeed algorithm allows you to recreate, on headphones, the rich sonic experience of listening to high-end speakers in a finely tuned room. Combined with a gorgeous equalizer and serious monitoring controls, CanOpener Studio is great for tracking — allowing performers to get the perfect headphone mix, and it’s also equally useful on the master output — to help correct or enhance your monitoring environment.

“CanOpener conjures speakers from your headphones.”

– Damon Krukowski, Pitchfork


“Crossfeed” is a generic term for a process that “feeds” or blends the left and right channels of a stereo audio signal in some way. Because sound is pretty good at bouncing and bending around things, every sound you’ve ever heard in a natural acoustic environment reaches both ears, at least in part. This is true for loudspeakers too: a sound fed from the right loudspeaker not only reaches your right ear, but a portion of the sound also reaches your left, far ear as well. The inverse is true of the left speaker: sounds emitted reach the left ear first, while a portion also reaches the right ear. So you could say that loudspeakers have a type of natural crossfeed: the left channel is “crossfed” to the right ear and vice versa.

For headphones, however, this is not true: sounds fed from the left channel of a pair of headphones only reach the left ear and have no natural crossfeed. CanOpener Studio’s crossfeed algorithm was designed to bring back the crossfeed that gets lost on headphones, making for a better, less fatiguing monitoring environment where judgements about space, depth, and panning are quicker and easier.


Stereo Spectroscope

CanOpener Studio features our unique stereo spectroscope: a new type of stereo metering that lets you inspect the stereo balance & width of each part of the frequency spectrum.

The CanOpener Studio StereoscopeThe CanOpener Studio Stereoscope

What does it represent?

The x-axis (horizontal), represents the left/right stereo field, and the y-axis (vertical) represents the frequency spectrum (low to high, bottom to top).

The location of each circle corresponds to its left/right balance and associated frequency band. The size and brightness of the circle corresponds to the loudness of that particular band.

In addition to the circles, a broad outline shape is drawn, showing the stereo width for all frequency bands.

What should I use it for?

The stereo spectroscope can help determine how much crossfeed should be applied to the signal to imitate listening on monitors. If the scope shows a wide, dispersed stereo field (especially in the low end), then you might want to increase the crossfeed amount. If the scope is showing a narrow, straight-lined stereo field (especially in the low end), then less crossfeed is probably appropriate.


CanOpener Studio includes a real-time stereo display called a goniometer (or vectorscope). By interpreting the goniometer, it’s possible to quickly deduce many characteristics about the stereo field and the precise relationship between left & right channels.

Here are some examples of how simple stereo signals appear in the goniometer:

L/R GoniometerL/R Goniometer

M/S GoniometerM/S Goniometer


Primary Controls



Varies the amount of crossfeed.

100% is generally a good starting point, though 150% is the truest to real-life loudspeaker listening. At 0%, the signal is totally unaffected.

  • Min 0%
  • Max 150%
  • Default 100%


Controls the width of the crossfeed soundstage.

Smaller speaker angles (less than 30°) place the sound more “in front” of the listener. Larger speaker angles (more than 45°) are more immersive and surrounding. This control affects the crossfeed only — not the entire soundstage.

  • Min 0°
  • Max 75°
  • Default 60°


The Equalization section borrows a portion of our esteemed Baxandall shelving filters from Tone Control to give you smooth, mastering-quality tone-shaping within CanOpener Studio.

Bass Gain

Amount of bass boost/cut.

To alter the center frequency of the bass shelf, see Bass Freq.

  • Min -15dB
  • Max 15dB
  • Default 0dB

Treble Gain

Amount of treble boost/cut.

To alter the center frequency of the treble shelf, see Treble Freq.

  • Min -15dB
  • Max 15dB
  • Default 0dB



Sums the left/right channels to mono.

  • Min Off
  • Max On

Flip L/R

Swaps the left and right channels.

  • Min Off
  • Max On


Inverts the phase of the right channel.

Use Polarity + Mono at the same time to monitor the sides of a stereo signal: all the information that differs between left and right channels.

  • Min Off
  • Max On


Turns down the output signal by the amount specified by Dim Level.

  • Min Off
  • Max On

Advanced Controls

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

To access CanOpener Studio’s advanced controls, click the ••• icon in the sidebar.

Crossfeed Realism

Controls the degree of realism in the idealized speaker model.

Most RealisticAdvanced delay and spectral modeling (recommended for most situations).
More RealisticSimplified delay modeling.
StandardThe classic crossfeed algorithm. No delay.

Though less realistic, “Standard” crossfeed realism has the advantage of a perfect, constant spatial frequency response.

Bass Frequency Bass Freq

Center frequency of the equalizer’s bass shelf.

  • Min 20Hz
  • Max 1000Hz
  • Default 250Hz

Treble Frequency Treble Freq

Center frequency of the equalizer’s treble shelf.

  • Min 1000Hz
  • Max 20000Hz
  • Default 2000Hz

Soft Start Time

Controls the Soft Start fade-in time.

Soft Start gently ramps up the volume when playback begins. This helps avoid loud transients that occur when starting playback in the middle of a phrase and minimizes listener fatigue (particularly important in long tracking, editing, or mixing sessions).

  • Min 0ms
  • Max 1000ms
  • Default 250ms

Dim Level

Sets the gain that is applied when the Dim is activated.

  • Min -36dB
  • Max 0dB
  • Default -20dB


Supported Channel Configurations

Input Channel # Output Channel #
2 2


  • Chris Conover
  • Ollie Hammett
  • Annlie Huang
  • Mark A. Jay
  • Ewan Macpherson
  • TaeHo Park
  • Jack Stratton
  • Diana Zheng

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 manually enabled or disabled via the “Enable Metering” User Preference.

Keyboard Shortcuts

ActionKeyboard Shortcut
Enter New Parameter ValueOnce you’re 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 ParameterTab
Jump to Previous ParameterShift + Tab or ` (backtick)
Escape Parameter Focus / Close any Open DrawersEsc
Toggle A/BA (N.B. For this to work, you must have a control selected.)
Shift A to B / Shift B to AShift + A — this “shifts” the current settings to the opposite A/B state; i.e. if you’re on the A state, hitting Shift+A will copy those settings to the B state. (N.B. For this to work, you must have a control selected.)

Right-Click Actions

Reset Control to DefaultRight-Click & select “Reset [control] to Default”
Read about Control in ManualRight-Click & select “Read about [control]”
Lock a control when Switching PresetsRight-Click & select “Lock [control] When Switching Presets”
Copy all current plugin settingsRight-Click & select “Copy all settings as URL to Clipboard”
Paste all plugin settingsRight-Click & select “Paste all settings from Clipboard”
Reset all plugin settings to defaultRight-Click & select “Reset all settings to default”
Go to the plugin’s product pageRight-Click & select “Goodhertz [plugin name]”

Right-Click Preferences

Always Open Advanced PaneBy default, this is false — 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.
Enable MeteringBy default, this is true — 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 InputBy 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.
Window SizeEnlarge or shrink the Goodhertz plugin window by selecting an option here. This will save your preference for all instances of this plugin.

Mouse Modifiers

ActionCombination (Mac)Combination (Windows)
Reset Parameter to Default ValueOption + ClickAlt + Click
Move Control with Coarse PrecisionShift + DragShift + Drag
Move Control with Fine PrecisionCommand + DragCtrl + Drag
Move Control with Normal PrecisionDragDrag


Unintentional digital clicks and pops are the worst. They happen for lots of reasons and often end up wasting 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 ≥ 10.9

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

Windows ≥ 7

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.