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Onsen Audio OS-251 v1.0.1 VST3 AU WiN MAC LiNUX FREE PLUGIN


OS-251 is a pure digital lo-fi synthesizer plugin for Mac, Windows and Linux. Available in VST3 and AU plugin formats for free.

OS 251 screenshot 1024x597 - Onsen Audio OS-251 v1.0.1 VST3 AU WiN MAC LiNUX FREE PLUGIN

Digital lo-fi sounds

OS-251 is a “JUNO” style digital subtractive synthesizer with a simple yet powerful DSP algorithm. Unlike other plugins that use analogue simulation, OS-251 uses digital algorithms to give warm, lo-fi sounds. The design of the oscillators and the selection of parameters were influenced by the JUNO-106, making it easier to express a thicker, chunkier sound.

The oscillator has alias noise (specific to digital signal processing) famous on classic samplers like E-mu SP-12 which adds lo-fi feeling to the sound. You can enjoy the powerful sound at modern sampling rates with your DAW.

Easy to use

Tired of overwhelming synthesizers with hundreds of parameters and presets? Then OS-251 is for you! OS-251 is equipped with only carefully selected parameters, allowing musicians to concentrate on music production. You can see every parameter at once, so you can have a stress-free experience. Because the number of the parameters is limited, you can create the desired sounds yourself quickly and you don’t have to spend your precious time choosing presets.

Key features

Up to 10 voices of polyphony
Oscillators (Sin, Square, Saw), with Shape parameter
Square sub oscillator
Noise oscillator
Biquad low-pass filter (LPF) with Frequency and Resonance parameters
Biquad high-pass filter (HPF) with Frequency parameter
Envelope generator which can control LPF and amplitude
Low-frequency oscillator (LFO) which can control LPF, amplitude, and Shape parameter
LFO sync
Flexible pitch controls (pitch bend width, octave, semitone, fine tuning)


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