VST Instruments

Onsen Audio – OS-251

OS-251

size 2 MB  / 7 MB  / 4 MB

OS-251 is a pure digital lo-fi synthesizer.

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.

  • 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.
  • Chorus.
  • Flexible pitch controls (pitch bend width, octave, semitone, fine tuning).
  • VST3 / AU.

ttps://onsenaudio.com/

OS-251-Windows  ( 2 MB )

OS-251-macOS  ( 7 MB )

OS-251-Linux  ( 4 MB )

Recent Posts

Borealis Audio Side B – Mastering Mojo

I just stumbled upon this gem today while digging for something to add a little character to my output chain,…

YS Psycho – Psycho-Acoustic FX

Are your mixes sounding a little too two-dimensional? I found a fix. You know the struggle - you want that…

PolarDesigner – Pattern Control Beast

Are your mixes sounding washed out because you picked the wrong mic pattern during the session? We've all been there—you're…

Transient Control – Free Shaper

Yo, what's good producers? Let’s talk about a real struggle we all face in the studio. You spend hours layering…

Setekh – Free Distortion VST

I’ve been digging through the deep corners of the web recently, hunting for something specific to add to my arsenal,…

EQ560 – Classic American Vibe WiN MAC

Yo, what's good creators? Let’s keep it 100 for a second - are your mixes sounding a little thin? Are…