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.