Dexed — FREE DX7 FM Synth Emulation (Open Source)
TL;DR: Dexed — free and open source. A faithful Yamaha DX7 FM synth emulation that loads original DX7 SysEx patches. 6 operators, 32 algorithms, and the iconic FM synthesis engine that defined 80s music. Original DX7 hardware goes for $200+ used. Dexed costs $0. Get it here.
What Is Dexed?
Dexed is a free, open-source FM synthesizer by Digital Suburban. It’s a software emulation of the Yamaha DX7 — the best-selling synthesizer of the 1980s. The DX7’s FM synthesis engine produced the electric pianos, basses, bells, and pads heard across thousands of records. Dexed recreates that engine and can load original DX7 SysEx patch data, giving access to decades of DX7 sounds.
Key Features
- 6 operators — Faithful recreation of the DX7’s 6-operator FM synthesis architecture
- 32 algorithms — All original DX7 routing configurations included
- SysEx compatible — Load original Yamaha DX7 patches directly (thousands available free online)
- Modern editor interface — Visual envelope and operator editing, far easier than the original hardware’s membrane buttons
- Cartridge manager — Organize and browse DX7 patch banks
- Open source — Code is available on GitHub, actively maintained by the community
What Producers Are Saying
Dexed is the standard recommendation for DX7 sounds in production forums. On Reddit’s r/synthesizers and KVR, it’s frequently cited as the best free FM synth plugin. Producers value SysEx compatibility — decades of DX7 patches from the original hardware work directly in Dexed. In “best free synth” threads, it consistently appears alongside Vital and Surge XT.
Who Is It For?
- Producers who want DX7 sounds — Electric pianos, metallic basses, FM bells, and classic 80s pads
- FM synthesis learners — The visual editor makes FM more approachable than the original hardware
- Retro/synthwave producers — Authentic DX7 tones are fundamental to 80s-inspired music
- Sound designers — 6-operator FM synthesis creates complex timbres not possible with subtractive synthesis
Pricing & Deal Details
| Regular Price | Deal Price | You Save | |
|---|---|---|---|
| Dexed | FREE | $200+ (100%) |
Dexed is free and open source under the GPL license. No account required. Download directly from GitHub or plugin distribution sites.
Alternatives at a Glance
| Synth | Price | Key Difference |
|---|---|---|
| Dexed | FREE | DX7-specific, loads SysEx patches, 6 operators |
| Native Instruments FM8 | $149 | 8 operators, modern FM workflow, beyond DX7 |
| Arturia DX7 V | $199 | Expanded DX7 with modern effects and modulation |
| Korg opsix Native | $149 | 6 operators, altered FM with filters and effects |
Dexed at $0 nails authentic DX7 sounds and SysEx compatibility. If you want FM synthesis beyond the DX7 spec, FM8 and opsix offer expanded architectures. If you want the DX7 sound with modern additions, Arturia’s DX7 V is the premium option.
Looking for more free options beyond FM synthesis? See our best free synth plugins roundup for a broader overview.
FAQ
Q: Can I load real DX7 patches? A: Yes. Dexed is SysEx compatible — load any original DX7 patch bank. Thousands are available for free download online.
Q: Is it really accurate to the DX7? A: Dexed aims for close emulation of the DX7 engine. Community consensus is that it captures the character of the original hardware faithfully.
Q: What formats does it support? A: VST, VST3, AU, and LV2 on Windows, macOS, and Linux. Check the GitHub repository for current builds.
Q: Is it still being updated? A: Yes. Dexed is actively maintained on GitHub with community contributions.
Get the Deal
The DX7 defined a decade of music. Dexed brings that engine to your DAW. Free. Open source. No limits.