Eight operators wired freely — no fixed algorithms
Any operator can modulate any other. Every connection carries its own depth and phase, and an operator can feed back into itself.
8-operator FM · wavetable · VST3 · CLAP · AU
Free ones frustrate. Good ones cost hundreds. So I built the in-between.
The price is the only small thing about it. Wavetable and FM both. Eight operators, three filter stages and the output all sit on one screen. You connect them by dragging an arrow from one to the next. An operator can be a sine, noise or a wavetable, and your DX7 banks load as they are. The UI runs in nine languages.
One-time purchase · 3 devices · offline activation
Listen
How it actually sounds
Every clip is a preset the author built, played exactly as it is saved. Only the loudness is matched between them.
The phrase is chosen to suit the patch. The rhythm clip plays two drum presets together.
Play it here
The real thing, in your browser
The synth below is not a recording and not a re-implementation. It is the same C++ DSP that ships in the VST3, compiled to WebAssembly and running as you play it.
Demo
Start the audio engine and the keyboard below becomes playable.
Nothing loads until you start it — the module is about 400 KB.
Go deeper
Walkthroughs by the author
Whatever the demo left you wondering about, the person who built it explains — on video and in writing. Both are first-hand, not copy written by somebody else.
Video
JapaneseA walkthrough of the FM / wavetable synth I just released (IMFMSynth)
A guided tour through the operators, the routing, the filters, the effects and the output stage, driving the real plugin.
The narration is in Japanese. Turn on YouTube's auto-generated subtitles and auto-translate them (Settings → Subtitles) to follow it in English.
Article
JapaneseIntroducing IMFMSynth, a new synthesizer plugin
The written introduction: why it was built and what each part does, with screenshots. Easier to skim than the video.
Written in Japanese; note's own translation feature renders it in English.
Inside
What you actually get
Wavetable operators (Serum and Vital WAV)
An operator can play a wavetable instead of a sine. The scan position is modulatable, and Serum- or Vital-style WAV tables load directly.
Hand-drawn envelopes with per-segment curves
Beyond the ADSR knobs, you can draw the envelope itself: as many points as you like, a curve per segment, and your own sustain and loop points.
Four modulation slots (six LFO shapes, tempo sync)
Six LFO shapes including sample-and-hold, with tempo sync, note divisions, fade-in and note-on phase reset. An ADSR can drive a slot too.
Three filter stages with key tracking and drive
Each stage has its own type, cutoff, resonance and slope, plus key tracking, drive and character.
Modulation routing wired with arrows
Operators, filters and the output share one screen, and you connect them by dragging an arrow from an output port to an input port. FM modulation, sends into the filters, and a filter's output going back into an operator's phase input are all drawn in the same place.
Effect rack: drive, chorus, delay, reverb
Drive, chorus, delay and reverb, running at the oversampled rate ahead of the output protection stage.
DX7 .syx bank import
Hand it a .syx and it takes in all 32 voices — ratios, fixed frequencies, key scaling, rate scaling, LFO and the sensitivities — as ordinary editable patches.
About the presets
Presets are in the works. They will arrive in the next version.
You can start from Init and go from there. Your own patches save and export, and DX7 banks (.syx) import.
Nine languages
The plugin's interface runs in Japanese, Chinese (Simplified and Traditional), Korean, English, German, French, Spanish and Russian. The demo above is already running in yours.
- 日本語
- 简体中文
- 繁體中文
- 한국어
- English
- Deutsch
- Français
- Español
- Русский
Descriptive labels — parameter names, waveform and noise names — are translated. Conventional technical notation such as LPF or dB/oct is left alone. You can switch at any time from the wheel inside the UI.
Also in the box
- Fixed-frequency oscillators
- Detune in cents
- Keyboard level scaling
- Rate scaling
- Per-operator velocity sensitivity
- Per-operator feedback amount
- Pitch envelope
- Note-on phase reset
- Per-connection phase offset
- Waveform invert
- 2× oversampling
- Output protection with soft clipping
- Per-voice pan and pan law
- Peaking EQ per filter stage
- 8-bit output mode
- Master ADSR bypass
Formats
Where it runs
Windows (VST3 / CLAP)
VST3, CLAP · Windows 10 or later, 64-bit
macOS (VST3 / AU / CLAP)
VST3, AU, CLAP · macOS 10.13 or later, Intel and Apple silicon
The Windows installer is currently unsigned. SmartScreen may warn the first time you run it — choose More info, then Run anyway.
License
Beta campaign$49$19one-time
$19 during the beta campaign — and it stays yours.
- Buy once. No subscription, no renewal, and the signature carries no expiry date.
- Three devices per license, managed from your account. Deregister one to move it to another machine.
- Activation is verified offline. After the first activation the plugin never needs the network again.
This is a limited-time beta campaign price. Feedback and bug reports are very welcome — write to satodeyannsu@gmail.com. Abuse just goes in the spam folder unread, so feel free to be blunt.