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Update: 2020-06-15

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EnvelopedSine is an additive synthesizer that computes 64 sine waves for each note. Difference to IterativeSinCluster is that this synth has AD envelope and saturator for each oscillator. EnvelopedSine is better suited for percussive sounds.

EnvelopedSine requires CPU which supports AVX or later SIMD instructions.

The package includes following builds:

macOS build isn’t tested because I don’t have Mac. If you found a bug, please file a issue to GitHub repository or send email to

Linux build is built on Ubuntu 18.0.4 and tested on Bitwig 3.1.2 and Reaper 6.03. Bitwig 3.1.2 seems to have a bug that occasionally blackouts GUI.



Place *.vst3 directory to:

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


Extract preset zip, then place preset directory to the OS specific path:

Preset directory name must be the same as the plugin. Make Uhhyou directory if it does not exist.

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 18.0.4, 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.

Color Configuration

At first time, create color config file to:

Below is a example of style.json.

  "fontPath": "",
  "foreground": "#ffffff",
  "foregroundButtonOn": "#000000",
  "foregroundInactive": "#8a8a8a",
  "background": "#353d3e",
  "boxBackground": "#000000",
  "border": "#808080",
  "borderCheckbox": "#808080",
  "unfocused": "#b8a65c",
  "highlightMain": "#368a94",
  "highlightAccent": "#2c8a58",
  "highlightButton": "#a77842",
  "highlightWarning": "#8742a7",
  "overlay": "#ffffff88",
  "overlayHighlight": "#00ff0033"

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.


Knob and slider can do:

There is an additional control for number sliders used for Octave, Seed etc.

Control with many blue vertical bars (BarBox) have some keyboard shortcuts. BarBox is used by Attack, Decay, Gain and Saturation. Shortcuts are only enabled after left clicking overtone control. Cheat sheet can be popped up by clicking plugin title on bottom left.

Input Control
Ctrl + Left Drag Reset to Default
Shift + Left Drag Naive Draw (Skip bars between frames)
Right Drag Draw Line
a Alternate Sign
d Reset Everything to Default
D Toggle Min/Mid/Max
e Emphasize Low
E Emphasize High
f Low-pass Filter
F High-pass Filter
i Invert Value (Preserve minimum)
I Invert Value (Minimum to 0)
n Normalize (Preserve minimum)
N Normalize (Minimum to 0)
p Permute
r Randomize
R Sparse Randomize
s Sort Descending Order
S Sort Ascending Order
t Subtle Randomize (Random walk)
T Subtle Randomize (Converge to 0)
z Undo
Z Redo
, (Comma) Rotate Back
. (Period) Rotate Forward
1 Decrease
2-9 Decrease 2n-9n

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.



4 big controls on top right.

Attack, Decay

Gain envelope attack and decay for each oscillator.


Gain for each oscillator.


Saturation gain for each oscillator.


Boost, Gain

Both controls output gain. Peak value of output will be Boost * Gain.


Add Aliasing

When checked, the synth enables rendering of sine waves over nyquist frequency.

Roughly speaking, nyquist frequency is the highest frequency that can be reconstructed from recorded digital signal. When generating sound, it’s possible to set value that is higher than nyquist frequency. However, the result may contain unexpected frequency due to a phenomenon called aliasing. Add Aliasing is option to add those aliasing noise.


Note octave.

Multiply, Modulo

Change sine wave frequency.

Equation is noteFrequency * (1 + fmod(Multiply * pitch, Modulo)). pitch is calculated from note pitch and overtone index. fmod(a, b) is a function that returns reminder of a / b.


Scaling factor for overtone controls.


Amount of right shift to overtone controls.


Randomize parameters. These are more effective when used with Unison.


When checked, reset random seed for each note-on.


Random seed. This value change random number sequence.

To Gain, To Attack, To Decay, To Sat.

Amount of randomization to overtone controls. Equation is value * random. Range of random is [0.0, 1.0).

To Pitch

Amount of randomization to pitch.

To Phase

Amount of randomization to phase.



Time length to change some parameter value to current one. Unit is in second.

List of parameters related to Smooth. * represents wild card.

Other parameter uses the value obtained from the timing of note-on for entire duration of a note.


Maximum polyphony. Lowering the number of this option reduces CPU load.


When checked, unison is enabled.

When unison is enabled, 1 note uses 2 voices. 1 voice is placed on left and other is placed on right. Combining Unison with Random.To Phase, Random.To Pitch, etc. can be used to make sound with stereo spread.


Attack*, Decay*

Multiplier for Attack/Decay in overtone control section.


When checked, it reduces click noise that occurs when the value of Attack and/or Decay is 0.


Exponent to Gain in overtone control. Following is the equation of gain of an oscillator.

Gain.Boost * Gain.Gain * pow(Overtone.Gain, Modifier.Gain^)
Sat. Mix

Mixing ratio of dry/wet signal of saturation. Dry : Wet becomes 0 : 1 when turned the knob to rightmost.



Number of all-pass filter.


Mixing ratio of dry/wet signal of phaser. Dry : Wet becomes 0 : 1 when turned the knob to rightmost.


LFO frequency.


Amount of feedback. Feedback is disabled when the knob is pointing to 12 o’clock. It becomes negative feedback when turned to left and positive feedback when turned to right.


Range of all-pass filter modulation by LFO.


Minimum value of all-pass filter modulation by LFO.


LFO phase offset.


LFO phase. This can be used to make sound with automation. Turning Freq to leftmost sets LFO frequency to 0.

Change Log

Old Versions


EnvelopedSine 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.