TWINFOLD

TWINFOLD is a plugin for adjusting stereo width. It processes only the difference between left and right, so whether you widen or narrow the sound, the mono sum stays exactly as it was.

Release date 2026-10-20

File size Win 3.57 MB / Mac 9.96 MB

OS Windows / macOS

Format Win: VST3 / Mac: VST3, AU (64-bit)

Disclaimer & License

1. No warranty
This software is provided without any guarantee that it will work. It may not work correctly depending on your combination of OS, DAW and host.

2. Limitation of liability
The distributor is not liable for any damage caused by using or being unable to use this software, including DAW crashes, data loss, effects on your productions, or any other direct or indirect damage.

3. License
✅ Use in commercial and non-commercial productions: allowed
✅ Installation on your own computers, including more than one: allowed
❌ Redistribution to third parties: prohibited (sharing the link to this page is fine)
❌ Modification, decompilation or reverse engineering: prohibited

4. Feature requests
This software is a personal project made out of the author’s own interest. Requests for new features, changes or bug fixes are not accepted, including those sent on social media or in comments.

5. Updates and support
There is no obligation to provide updates or support, and distribution may end without notice. Bug reports may not be received or addressed.

6. Governing law
These terms are governed by the laws of Japan. This is a translation of the Japanese original; if they differ, the Japanese version prevails.

I agree to the disclaimer and license above Free Download 3.57 MB

About this plugin

TWINFOLD has WIDTH and BASS MONO, a vectorscope, a phase correlation meter, a MONO LOSS meter (how much level drops when summed to mono), and a ZERO LATENCY mode. TWINFOLD Pro, which adds per-band width control, STEREOIZE and more, is available on Gumroad (¥500) / itch.io ($3.25).

Feature	TWINFOLD (free)	TWINFOLD Pro
WIDTH (overall width, 0 to 200%)	✓	✓
BASS MONO (sums the low end to mono)	✓	✓
ZERO LATENCY (zero-latency mode)	✓	✓
Vectorscope and phase correlation meter	✓	✓
MONO LOSS meter	✓	✓
Mono track support	✓	✓
A/B comparison	✓	✓
Factory presets	7	14
Per-band width for LOW / MID / HIGH (drag the crossovers on screen)	—	✓
Per-band correlation display	—	✓
RECOVER (makes up the level of narrowed bands)	—	✓
STEREOIZE (adds width to mono sources)	—	✓
AUTO WIDTH (automatic width adjustment)	—	✓
MONO / SIDE monitoring	—	✓
Save, delete and export user presets	—	✓
Price / where to get it	Free (official site / Gumroad / itch.io)	¥500 (Gumroad) / $3.25 (itch.io)

Video

Changelog

2026-10-26 V1.1.0 English support

Installation (Windows)

Download

Select Windows in the download box above and save the .zip file.

Extract

Extract the zip file and take out the .vst3 file.

Copy to the VST3 folder

Copy the .vst3 file to C:\Program Files\Common Files\VST3\.

Scan in your DAW

Restart your DAW or run a plugin scan, and it will show up.

Installation (macOS)

Download

Select macOS in the download box above and save the .zip file.

Extract

Extract the zip file and take out the .vst3 and .component files.

Copy to the VST3 folder

Copy the .vst3 file to ~/Library/Audio/Plug-Ins/VST3/. To open it, choose Go → Go to Folder in Finder and enter this path.

If you use AU

Copy the .component file to ~/Library/Audio/Plug-Ins/Components/.

Unblock it in macOS

Open Terminal (Applications → Utilities → Terminal), type xattr -dr com.apple.quarantine followed by one space, then drag the .vst3 file you copied into the Terminal window and press Return. Do the same for the .component file. Without this step, macOS says the plugin “is damaged and can’t be opened” or that it “cannot verify the developer”, and your DAW will not load it. You need to do this again whenever you reinstall it for an update.

Scan in your DAW

Restart your DAW or rescan plugins, and it will show up. If the AU does not appear, restart your Mac.

Manual

Read the manual Online (HTML)