A compact four-operator FM synthesizer
The little giant of FM sound that gave us Lately Bass
Released in 1987, the Yamaha TX81Z is a four-operator FM tone generator in a 1U rack. Conceived as an affordable way to bring the FM synthesis pioneered by the six-operator DX7 to more musicians, this small unit nevertheless holds features that even its bigger siblings lacked: where earlier FM synths offered only sine waves, each of the TX81Z’s operators can choose from eight waveforms. Combined with the character of its distinctive analog circuitry, this gives it an appealing sound quite unlike the DX7.
Above all, the preset “Lately Bass” is the sound that wrote the TX81Z into music history. With its distorted harmonics, razor-sharp attack and tenacious low end, it anchored countless hits from the late 1980s through the 1990s, above all in dance music.
It was never an easy machine to program from its front panel, but its affordable price and iconic sounds earned it a place in the studio racks of countless musicians, including, back in the day, the developer of this plugin.
The latest TX81Z sound, refined by hardware measurement
The TX81Z’s sound is concentrated in a single FM chip, the YM2414 (better known as the OPZ), and its output stage. Being digital synths, Yamaha’s FM chips have been documented and emulated many times before. But once I focused on the TX81Z as a single instrument, it became clear that those implementations fell far short. And so, as with Synth-80, the development of Synth81Z began with exhaustive measurement of the hardware.
In the end, it matches the hardware in detail: the phase resolution of the operators and the rounding of the waveform tables, the fine detail of each of the eight waveforms, output levels that change with the algorithm, the timing of every envelope step, the response to the LFO, velocity and controllers, and the frequency response from the DAC through the output stage. Everything, “Lately Bass” included, was then pushed to the limit by ear against recordings of the real unit.
Please try the demo and compare the sound for yourself.
- Up to 32 voices of polyphonyChoose 8, 16, 24 or 32 voices. Eight matches the hardware; the higher settings are the software equivalent of stacking several chips.
- Eight-part Performance modeHardware-compatible layers, splits and multitimbral setups, plus a mode with continuous pan and an independent LFO for every part, making it comfortable to use as software.
- Five-slot effects rackTwelve high-quality effects inherited from Synth-80: four choruses (Synth, Studio, Pitch and Digital), Delay, Phaser, Flanger, EQ, Compressor, Distortion, Reverb and Arpeggiator.
- Editor and librarianConnect a real TX81Z over MIDI and your edits in the plugin are mirrored to the hardware. SysEx send/receive for voices, Performances and tables, .syx/.mid import and a bank builder let you keep using your hardware voice library.
MIDI Learn and DAW automation are supported as well. None of these additions alters the hardware sound: set the polyphony back to 8 and you have the behaviour of a single chip, exactly like the original.
A user interface that shows all of FM on one screen
The original TX81Z had to be programmed through a two-line LCD and a handful of buttons. Synth81Z inherits the philosophy established with Synth-80, putting every parameter you need on a single screen, so the waveform, frequency, output level, envelope and scaling of all four operators are visible at once, with no page switching.
Each operator has its own colour, matched to the numbers in the algorithm diagram, so you can see at a glance which operators are producing sound and which are modulating. Envelopes are drawn as graphs and waveforms are shown as icons. Click any parameter label and a hint opens right there, explaining in English or Japanese how that parameter shapes the sound, so there is no need to go back and forth to the manual. Direct numeric entry (including frequency ratios), per-module copy and paste, and window resizing are all supported.
The controls follow the same conventions as Synth-80, so once you know one, you know the other.
Pair it with Synth-80 for an even more powerful studio
The analog SUPER JUPITER and the FM TX81Z. In the late 1980s, analog and FM sat side by side in almost every studio rack, each covering what the other could not. Thick analog pads, brass and leads go to Synth-80; sharply defined FM basses, electric pianos, bells and sequences go to Synth81Z. Both come with the same high-quality sound and the same simple user interface.
Synth-80 and Synth81Z share a common design for the five-slot effects rack, MIDI Learn, the preset browser and more. In particular, effects can be copied between Synth81Z, Synth-80 and Synth-80 FX. And both can serve as an editor and librarian for their hardware counterparts.
Pared down to the absolute essentials, this is a synthesizer I am especially proud of. I hope you will make it part of your studio.
Download the demo
After purchase, you can use it as the full version immediately.
Version 1.0.0
Additional Patches by Sound Creators
High-quality additional patches created by experienced sound designers are available.
- Added September 29, 2026 - 46 Voices / 6 Performances by Saif Sameer (Bundled with Ver. 1.0.0)
Pricing
Specifications
- Included plugins
- Synth81Z Instrument
- Editor & Librarian
- Full integration with a real TX81Z (SysEx send/receive and automatic mirroring of voices, Performances and tables, .syx / .mid import, bank builder)* A MIDI interface is required to connect the hardware.
- MIDI Learn / Automation
- DAW automation and MIDI CC Learn, including the effects and the Performance mixer, with map save/load
- Licensing
- Online activation or Key file (offline activation on the authorized machine)
- Factory presets
- 360+
Recommended specs
Windows
- Windows 10 or later (64-bit)
- 4 GB RAM
- 4-core CPU, 3 GHz
- 100 MB free disk space
- ARM processors are not supported on Windows
Formats: Standalone / VST3 / AAX
VST2 and 32-bit are not supported.
Apple (Mac)
- macOS 10.15 or later
- 4 GB RAM
- 4-core CPU, 3 GHz or Apple M1
- 100 MB free disk space
- Apple Silicon and Intel (Universal Binary)
Formats: Standalone / VST3 / AU / AAX
VST2 and 32-bit are not supported.
Developer: Jun Murakami (real name Jun Takahashi). He began his music career in 1999 as a composer for film and visual media, with credits including the TV anime “Steins;Gate” and the Otsuichi-based film “GOTH.”
Since 2011 he has been with MAGES. Inc., handling music production for numerous artists and IPs as a music director/producer and A&R (“Laid-Back Camp,” “Plastic Memories,” “B-PROJECT,” “Eri Sasaki,” “cadode,” “Konomi Suzuki,” and more).
Since 2025 he has worked as a freelancer. In recent years he has focused on programming, also providing DX support for audio production companies and music labels.