OctaSine

A free and open source frequency modulation-based synthesizer plugin. Runs on macOS, Windows and Linux in VST2-compatible hosts.

Latest version: 0.5.3 (2021-07-18). Release notes.

This is a beta release - you might encounter bugs.

macOS (Intel/Rosetta 2)

After downloading the archive, unzip it and move OctaSine.vst to your VST2 plugin directory. Typically, it is /Library/Audio/Plug-Ins/VST/.

You might need to allow MacOS to open applications from any developer. To do this, open a terminal window, enter sudo spctl --master-disable, press enter, enter your password and press enter again. More info here.

Windows 10 (64-bit)

After downloading the archive, unzip it and move OctaSine.dll to your VST2 plugin directory. The standard locations are:

C:\Program Files\VSTPlugins or
C:\Program Files\Steinberg\VSTPlugins or
C:\Program Files\Common Files\VST2 or
C:\Program Files\Common Files\Steinberg\VST2

Ubuntu 20.04 (64-bit)

After downloading the archive, unzip it and move OctaSine.so to your VST2 plugin directory.

You might also need to install Vulkan graphics drivers. More information here.

Other Linux distributions

Please build OctaSine from source.

Distributed under the AGPLv3 license.

OctaSine screeshot

Features

Four operators

Four FM operators with parameters for volume, panning, modulation index, feedback, frequency modifiers (ratio, free and fine), envelope values (attack, decay, release) and toggling of white noise mode.

Flexible routing

Flexible routing allows setting the operator modulation target (with some limitations) as well as the percentage of signal that is simply added to the final output, enabling additive synthesis.

Four LFOs

Four LFOs with multiple waveforms, oneshot and loop modes and optional DAW BPM sync. They can target most operator parameters and most parameters of lower-index LFOs.

ADSR envelopes

Each operator is connected to an attack-decay-sustain-release volume envelope with logarithmic slopes.

White noise mode

Per-operator white noise mode makes it easy to create percussive sounds such as hi-hats and cymbals.

Cross-platform

Runs on macOS, Windows 10 and Linux in VST2-compatible DAWs. Synthesis is SIMD-accelerated where possible.

Audio samples

Frequently asked questions

How do I suggest improvements or report a bug?

If you want to suggest improvements or report a bug, please open an issue. To do this, you need to create a GitHub account. It is easier than it sounds - you only need an email address and a password.

If you're reporting a bug, please use the "Bug report" template.

How do I export and import patches?

Please use the functionality provided by your DAW for exporting/importing .fxp/.fxb files.

Ableton Live
Use the disk icon to save individual patches or the whole bank. Use the folder icon to select and load previously saved patches or patch banks.
REAPER
Use Export VST patch/bank file (.fxp/.fxb)

Why is the plugin called OctaSine?

The name OctaSine comes from the four stereo sine-wave operators. Frequency modulation is done twice per operator, enabling modulation panning.