NUX releases Optima Air firmware V2.3.8 for macOS and Windows
September 26, 2025 · 1 sources
NUX released firmware version 2.3.8 for the Optima Air on September 26, 2025, in separate macOS and Windows downloads. The maker lists the same version number and update date for both files1.
The Optima Air is a dual-switch acoustic guitar simulator with a preamp, which NUX describes as intended for acoustic and electric guitar players. It combines an impulse response loader with a preamp section carrying Gain and a 3-band EQ (Bass, Middle, Treble), plus a one-knob Reverb control that adjusts dry/wet and decay and can be switched off at 0. The pedal ships with 15 impulse response files, each optimized for a guitar type and pickup type, and includes a profile capture function for creating IR files from an acoustic guitar's sound1.
The maker's page states the pedal's specifications as follows1:
| Specification | Detail |
|---|---|
| Sampling | 24-bit, 48-kHz |
| Built-in profiles | 15 acoustic guitar IRs with IR level control |
| Preset slots | 9 |
| Input / Output | 6.35mm (1/4-inch) jacks |
| Send/Return | 6.35mm (1/4-inch) effect loop |
| Auxiliary input | 3.5mm (1/8-inch) |
| Headphones output | 3.5mm (1/8-inch) |
| DI output | XLR |
| USB | Micro B, for USB audio stream and editor software |
| Power | 9V negative tip adapter |
NUX says the pedal connects to a computer over USB to run the Optima Air software for creating, editing and saving presets, and to update the pedal when new firmware is released. The maker also states that the preamp is driven by its white box algorithm, a physical model of the Neve 10731.
"Version: 2.3.8"
The page does not list the changes included in version 2.3.8. It also lists editor software at version 2.1.12 for Windows and macOS, a format converter at version 1.2.4, and ASIO drivers at version 3.29.0 for Windows 7 and 5.30.0 for Windows 10 and above, with no update dates given for those files1. No price is stated on the page.
Sources (1)
- Optima Air - NUX Audio, nuxaudio.com