Back to Index

Update: 2023-12-02

Table of Contents


AccumulativeRingMod is a ring modulator that uses accumulated amplitude of input signal as the phase. When applied to simple waveforms like a sine wave, it sounds similar to FM.

full package contains following builds.

Linux build is built on Ubuntu 22.04. If you are using distribution other than Ubuntu 22.04, plugin will not likely to run. In this case, please take a look at build instruction.

macOS package is recommended for macOS user. I can’t purchase Apple Developer Program, therefore installation requires a workaround to bypass Gatekeeper. Details of workaround are written in Installation -> macOS Specific section.


Feel free to contact me on GitHub repository or

You can fund the development through Current goal is to purchase M1 mac for better macOS support. 💸💻



Move *.vst3 directory to:

DAW may provides additional VST3 directory. For more information, please refer to the manual of the DAW.


Notice: Some plugins don’t have presets provided by Uhhyou Plugins.

Presets are included in the plugin package linked at the top of this page. To install presets, follow the steps below.

  1. Download plugin from a link at the top of this page.
  2. Extract downloaded zip file.
  3. Open presets directory placed in extracted package.
  4. Move Uhhyou directory into an OS specific preset directory (see below).

Below is a list of preset directories for each OS.

Preset directory name must be the same as the plugin. If preset directory does not exist, create it.

Windows Specific

If DAW doesn’t recognize the plugin, try installing C++ redistributable (vc_redist.x64.exe). Installer can be found in the link below.

Linux Specific

On Ubuntu 22.04, those packages are required.

sudo apt install libxcb-cursor0  libxkbcommon-x11-0

If DAW doesn’t recognize the plugin, take a look at Package Requirements section of the link below and make sure all the VST3 related package is installed.

REAPER on Linux may not recognize the plugin. A workaround is to delete a file ~/.config/REAPER/reaper-vstplugins64.ini and restart REAPER.

macOS Specific

Important: full package is not confirmed working. When using full, try removing following files.

macOS package doesn’t contain above files. Also, all packages are in “ad-hoc signing” state set by codesign command.

Remove Quarantine

When trying to run plugin first time, following message may appear on macOS.

<PluginName>.vst3 is damaged and can't be opened. You should move it to the Trash.

In this case, open terminal and try running one or both of following command to unzipped .vst3 directory. Replace /path/to/PluginName.vst3 according to your install location.

xattr -rd /path/to/PluginName.vst3
xattr -rc /path/to/PluginName.vst3

Bypass Gatekeeper

Plugin may be considered as unsigned/un-notarized application. In this case, open System Preferences, go to Security & Privacy → General, then click the Open Anyway button. The offcial Apple help page linked below has screenshots for the procedure. See “If you want to open an app that hasn’t been notarized or is from an unidentified developer” section.

If the plugin is still not working, try changing install location to /Library/Audio/Plug-ins/VST3/ or /Users/$USERNAME/Library/Audio/Plug-ins/VST3/ whichever still haven’t tried.

If all the above methods do not work, try following the steps below.

  1. Open terminal and run sudo spctl --master-disable.
  2. Go to System Preferences → Security and Privacy → General → Allow apps downloaded from, then select “Anywhere”.

Beware that steps above degrades security of your system. To revert the settings, follow the steps below.

  1. Go to System Preferences → Security and Privacy → General → Allow apps downloaded from, then select option to “App Store and identified developers”.
  2. Open terminal and run sudo spctl --master-enable.

Applying codesign

Note This section may not relevant to macOS packages. However it’s not verified. (GitHub issue)

To use full package, following command might be used.

sudo codesign --force --deep -s - /path/to/PluginName.vst3

codesign might not be available without installing Xcode.


GUI Style Configuration

At first time, create color config file to:

style.json will be loaded for each time a plugin window opens.

Several color themes are available on the link below.

Below is a example of style.json.

  "fontFamily": "Tinos",
  "fontBold": true,
  "fontItalic": true,
  "foreground": "#000000",
  "foregroundButtonOn": "#000000",
  "foregroundInactive": "#8a8a8a",
  "background": "#ffffff",
  "boxBackground": "#ffffff",
  "border": "#000000",
  "borderCheckbox": "#000000",
  "borderLabel": "#000000",
  "unfocused": "#dddddd",
  "highlightMain": "#0ba4f1",
  "highlightAccent": "#13c136",
  "highlightButton": "#fcc04f",
  "highlightWarning": "#fc8080",
  "overlay": "#00000088",
  "overlayHighlight": "#00ff0033"

Font Options

Following is a list of font options.

To use custom font, place *.ttf file into custom font path: *.vst3/Contents/Resources/Fonts.

Notice: If the combination of fontFamily, fontBold, fontItalic is not exists in custom font path, default font of VSTGUI is used.

If fontFamily is set to empty string "", then "Tinos" is used as fallback. If the length is greater than 1 and the font family name doesn’t exists, default font of VSTGUI is used.

Styles other than bold, italic or bold-italic are not supported by VSTGUI. For example, “Thin”, “Light”, “Medium”, and “Black” weights cannot be used.

Color Options

Hex color codes are used.

First letter # is conventional. Plugins ignore the first letter of color code, thus ?102938, \n11335577 are valid.

Do not use characters outside of 0-9a-f for color value.

Following is a list of color options. If an option is missing, default color will be used.


Right Click on the controls pops up a context menu provided by DAW.

Knob and slider provides following controls:


In some DAW, main input is fed to sidechain input, when sidechain input is not routed.


AccumulativeRingMod is good at adding variation to simple waveforms such as sine wave and sawtooth wave. It is recommended to lower Modulation and Warp -> Amount when applying to recorded instrument sounds.

It might make some nice sounds by automating Modulation and Warp -> Amount with an external envelope generator or LFO. Also, it may sounds better with decaying sound because the amount of modulation changes depending on the amplitude of input signal.

To modulate using a part of pre-mixed sounds, such as snare drum in a drum loop, try following steps.

  1. Narrow down target frequency band by changing Lowpass and Highpass.
  2. Increase Gate to silence unnecessary parts.
  3. Enable Envelope to adjust the texture.

Block Diagram

If the image is small, use Ctrl + Mouse Wheel or “View Image” on right click menu to scale.

Diagram only shows overview. It’s not exact implementation.


Characters inside of square brackets [] represents unit. Following is a list of units used in AccumulativeRingMod.



Output gain.


Mixing ratio of input and output.


Link [Hz]

Cutoff frequency of lowpass filter used to synchronize phase of 2 ring modulators on left (L) and right (R) channels.

When signal of L and R are different, phase of ring modulator will become out of sync. After that, the difference of the phases stays there even if the L and R signal goes back to the same. Sometimes this results in undesired stereo spread. Link can be used to suppress this stereo spread.

Higher values of Link will synchronize faster, lower values will synchronize more slowly. When Link is 0, synchronization is disabled.


Amount to swap stereo channels.

When Cross is 0, it stays the same, when it’s 0.5 it mixes left and right evenly, and when it’s 1 it completely swaps left and right.


Offset between phase of two ring modulators on stereo.

Setting Offset other than 0 spreads stereo image of output.



Amount to warp the phase of ring modulator.

Beware that CPU load increases when Warp -> Amount is not 0.


Smoothing [s]

Time to reach new value after change of parameter.


Oversampling ratio.

Increasing oversampling ratio may suppress gritty noise that appears when Modulation value is high. However, CPU load increases with higher oversampling ratio.

Main Input, Side Chain

Same set of parameters are available for main input and sidechain input.


Intensity of modulation.

Lowpass [Hz]

Cutoff frequency of lowpass filter applied to modulation signal.

Highpass [Hz]

Cutoff frequency of highpass filter applied to modulation signal.

Gate [dB]

Gate amplitude threshold for modulation signal.

Modulation stops when amplitude of filtered modulation signal goes below threshold set by Gate.

Envelope [s]

Lighting up Envelope button enables envelope follower. The value on right side is release time of envelope.

Asymmetry - X Pre

Mixing ratio of raw and full-wave rectified modulation signal before passing filters.

Asymmetry - Y Post

Mixing ratio of raw and full-wave rectified modulation signal after passing filters.

Change Log

Old Versions


AccumulativeRingMod is licensed under GPLv3. Complete licenses are linked below.

If the link above doesn’t work, please send email to

About VST

VST is a trademark of Steinberg Media Technologies GmbH, registered in Europe and other countries.