Digital Lo-fi Sounds · 25 MBOS-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.
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.
Up to 24 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
Unison
Flexible pitch controls (pitch bend width, octave, semitone, fine tuning)
Preset manager
Clipping indicator
Version 1.2.1
Fixed broken oscillator gain parameters
Version 1.2.0
Added 'unison' parameter
Added clipping indicator
Improved performance by stopping calculation of oscillator value when its gain is zero
Version 1.1.1
Added native support for Apple M1
Avoided to take keyboard focus (Now you can use DAW's keyboard shortcuts when the OS-251's UI is focused)
Version 1.1.0
Added proprietary preset manager
Added LV2 version for x64 Linux
Changed the maximum number of voices from 10 to 24
Fixed noise in the chorus effect
Fixed wrong 'shape' value when a note starts
Smoothed HPF frequency parameter to suppress noise when preset is changed
Adjusted font size for Windows
Version 1.0.1
Fixed the problem that OS-251 didn't work in macOS 10.12, 10.13, 10.14
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