Opto 2A is a tube electro-optical compressor plugin from Antelope Audio, modeled on a 1960s broadcast compressor built around a T4 optical attenuator cell.
Opto 2A at a glance
| Developer | Antelope Audio |
|---|---|
| Type | Effects / Compressor |
| Operating systems | Windows, macOS |
| Price on Plugin Boutique (October 2026) | €137.84 |
What Opto 2A does
The plugin uses a T4 optical attenuator as its gain element, a technology stemming from optical sensors, and its release behaves in two stages: about half of the release happens around 60 ms, and the rest occurs gradually. The release slows when the above-threshold signal is longer or stronger, and the average attack time is fixed at 10 ms, so the compression ratio varies with the input signal.
Key features
- Gain and Peak Reduction controls. The interface has only Gain and Peak Reduction knobs, and a switch converts the compressor into a limiter.
- Two-stage release. Roughly half of the release occurs around 60 ms and the remainder follows gradually, which the developer credits for smooth compression.
- Input-dependent ratio. The compression ratio changes with the input signal rather than being set as a fixed value.
- Fixed attack. The average attack time is fixed at 10 ms.
Compatibility
Opto 2A is available for Windows and macOS. The formats and minimum system requirements are listed on the developer side.
Who it is for
The plugin is intended for vocalists, voice-over artists, bass players and engineers who want a simple optical compressor with a two-stage release.
Plugins similar to Opto 2A
| Plugin | Developer | Type | Formats | Systems | Price |
|---|---|---|---|---|---|
| Opto 2A | Antelope Audio | Compressor | Windows, macOS | €137.84 | |
| Opto Compressor | IK Multimedia | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €59.49 |
| OPTO Compressor | Softube | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €147.76 |
| White 2A Leveling Amplifier | IK Multimedia | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €118.99 |
| Custom Opto | Slate Digital | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €98.18 |
Price and availability
Opto 2A was listed on Plugin Boutique in October 2026 at €137.84. Prices change often, so the store page shows the current one.
Opto 2A FAQ
Is there a working serial key or keygen for Opto 2A?
Serial keys and keygens are searched as serial crack and keygen terms, and the developer does not issue them.
Is Opto 2A available as a torrent or magnet link?
Torrent and magnet link copies circulate as unofficial files, and the plugin is distributed by Antelope Audio.
Which operating systems does Opto 2A support?
The plugin is listed for Windows and macOS.