OTODESK has launched Atmosphere, a free and open-source algorithmic reverb plugin for Home windows.
Atmosphere is a 16-channel Suggestions Delay Community reverb from Makoto Iida, a solo developer and hobbyist producer behind OTODESK.
I requested the developer how he made the plugin and was stunned to be taught that it’s not based mostly on convolution and that there are not any impulse responses concerned. Makoto says the corridor and studio presets are algorithmic approximations formed with RT60 curves, early reflection patterns, and absorption settings moderately than sampled areas.
I requested Makoto about this immediately as a result of reverb plugins usually combine algorithmic design and sampled areas. His reply was clear. Atmosphere makes use of a 16-channel FDN for the reverb core, whereas the early reflections are generated with the Picture Supply Methodology.
The event story is fascinating, too. Makoto says he isn’t a skilled audio engineer, so he rebuilt the plugin from tutorial papers whereas utilizing AI closely as a pair-programming and debugging associate.
In different phrases, AI helped him write and repair the C++ code, however Makoto says the design decisions got here from studying the analysis, selecting the algorithms, setting the FDN topology, tuning the absorption mannequin, and adjusting the presets by ear in opposition to reference recordings.
Additionally, for the reason that undertaking is open-source, anybody can examine the code on GitHub.
Atmosphere consists of seven reverb algorithms, overlaying ROOM1, ROOM2, HALL1, HALL2, PLATE, SPRING, and GOLDFOIL. The manufacturing facility preset record consists of 21 areas and reverb sorts impressed by Abbey Highway Studio 2, Vienna Musikverein, Concertgebouw, Carnegie Corridor, EMT 140 plates, spring tanks, cathedrals, and extra.
The FDN core makes use of a Quick Walsh-Hadamard Remodel suggestions matrix, with 16 prime-tuned delay traces designed to keep away from apparent comb filtering.
Every FDN channel additionally has a 10-band GEQ absorption stage based mostly on the Valimaki-Liski method for frequency-dependent RT60 shaping. In plain English, the reverb can decay in a different way throughout the frequency spectrum, which is a giant a part of making an area really feel extra pure or extra stylized.
There may be additionally an ADAA saturator with Heat, Tape, Tube, and Arduous modes, plus stay acoustic readouts for D50, C50, C80, and EDT. The Professional mode unlocks per-band RT60 multipliers from 31 Hz to 16 kHz, Low/Mid/Excessive Tilt controls, and the saturation kind selector.
Atmosphere is offered as a free GPLv3 launch. It runs on Home windows 10 and 11 in VST3 and standalone codecs, requires an AVX2-capable CPU, and was developed and examined in Ableton Stay 11 and 12. macOS and AU aren’t supported, and OTODESK recommends Ableton Stay as a result of different DAWs are unverified.
Obtain: OTODESK Atmosphere (FREE)
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Final Up to date on June 2, 2026 by Tomislav Zlatic.
