Imagine combining 8 mono synths to create a massive, authentic analog sound! This unique sound is born from the subtle variations and imperfections across each voice card. Certain electronic components, especially those in the classic OB-X circuits, introduce rich layers of harmonic distortion at various points—from the filters and VCA to the output stage. OB-Xtreme focuses specifically on recreating these imperfections, with a special emphasis on delivering that signature "Growl" at the output stage.
Now introducing OB-Xtreme V3, the latest evolution in the OB-Xtreme series. While
OB-Xtreme 1 was
a simpler, streamlined interpretation of the OB voice card architecture, V2 refined this approach,
staying true to
the specifications and feel of the original OB-X and OB-Xa designs.
V3 takes the synthesis experience further, delivering new features and significant
improvements
while maintaining preset compatibility with V2.0, and is offered as a complimentary upgrade for all
existing V2 users.
Below is a summary of the OB-Xtreme 3.0 features. In essence, OB-Xtreme functions as an
8-voice polyphonic, 8-voice unison mono, or true mono synth. The Unison mode adds a
rich,
thick texture by enabling polyphonic unison, which offers a powerful 8x8 voice
configuration
with adjustable voice clones (configurable as 1, 3, or 7 clones per voice).
Core OB-X/OB-Xa features are faithfully included, with SAW, PULSE, and TRI oscillator
shapes,
as well as the unique SAW+PULSE combination, which can add an extra octave harmonic based on the pulse
width
setting.
Filter options include a 2-pole and a 4-pole mode: The 2-pole filter, based on the OB-X,
provides the smooth, resonant SVF (State Variable Filter) response, while the 4-pole filter, modeled
after the
CEM3320, offers a Moog-like resonance at lower cutoff values. High-pass and band-pass outputs are
available in
2-pole mode, along with an optional filter "bleed" for added authenticity.
The Xtreme Factor control manages emulated OTA-induced distortion, particularly the
classic
CA3080 chip distortion used throughout the OB-series circuits. Users can push these settings beyond the
original
specifications for more aggressive tones or stay within traditional limits for a classic OB sound. Both
PRE and
POST distortion circuits can be bypassed independently for flexibility, with PRE affecting lower notes
and POST
acting linearly across the range.
Additionally, OB-Xtreme offers under-the-hood controls for fine-tuning the voltage offsets of each voice card, which is essential for replicating authentic analog character. This approach uses Virtual Component Modeling (VCM) to mimic analog nuances effectively without excessive setup time. Seven macro sliders provide quick access to these settings:
You can apply small random deviations per note in real-time or scatter them across all eight voices. These voltage offsets are visually represented in the interface with positive or negative voltages (yellow/blue), making it easy to see adjustments. Tuning individual cards in semitone steps (up to +1 OCT) opens creative possibilities like a pseudo-chord mode when using Unison mode.
spans from early version 1.0, 2.0 and upcoming version 3.0 (coming up)
In the world of analog synthesizers, imperfections aren’t merely tolerated—they’re celebrated. They breathe life into sounds, creating textures that digital systems struggle to emulate. OB-Xtreme embraces this philosophy fully, bringing vintage-inspired warmth and complexity into the digital realm with its Xtreme Factor and customizable voltage offsets for each voice card. These two features together represent the heart of OB-Xtreme’s sonic character, where “the beauty and the dirt” of analog synthesis intersect to produce something truly unique. Nothing is like 8x8 voices drifting with portamento.
The Xtreme Factor in OB-Xtreme is a highly expressive control that emulates OTA (Operational Transconductance Amplifier)-induced distortion, a key ingredient in the legendary sound of classic synths like the Oberheim OB-X. In real analog circuits, OTAs such as the CA3080 are found at various points in the signal path, including the filter, VCA, and output stages. As these components process audio signals, they inherently introduce harmonic saturation and distortion, shaping the sound in ways that feel organic and musical. By modeling this distortion digitally, the Xtreme Factor control lets users dial in anything from subtle saturation to extreme distortion, granting a vast range of tonal possibilities.
This control is not just about adding loudness or fuzz—it’s about emulating the depth and complexity of analog warmth. When the Xtreme Factor is engaged, it can add a hint of growl or push the sound into a rich, aggressive territory. The beauty of the Xtreme Factor lies in its ability to give each voice a different level of character; set it to a minimum for clean, traditional tones, or push it beyond original specs for something truly “XTREME.” By enabling both PRE and POST distortion circuits to be used independently, OB-Xtreme offers even more versatility. PRE distortion affects the lower register more heavily, while POST distortion applies evenly across the entire range, giving users granular control over the kind of saturation they want.
A fundamental part of analog synthesis is the natural variation in pitch, filter response, and envelope timing that occurs between voice cards. In the original OB synths, each voice card was like an individual personality, with slight imperfections that gave each note a unique character. OB-Xtreme’s voltage offset controls allow users to replicate this organic quality by introducing variability across the eight voice cards. By adjusting offsets, users can create intentional inconsistencies in tuning, filter envelope offsets, pulse width modulation, and more, crafting a soundscape that feels “alive” rather than sterile.
Voltage offsets represent the beauty of analog error—a microcosmic reminder of why analog sounds are beloved for their richness and unpredictability. When voltage offsets are applied, the result is subtle but incredibly impactful: a chorus-like effect, delicate detuning, or a slight shift in modulation that adds dimension to the overall sound. For example, by adjusting the oscillator spread (tuning offsets for OSC 1 and OSC 2), OB-Xtreme can mimic the slight drift found in real analog oscillators, which helps create a sound that feels both rich and vintage.
Try increasing the Spread parameter with 8 unison clones and you are reaching super chorus territory.
When combined, the Xtreme Factor and voltage offsets offer users the best of both worlds: control and character. Together, they bring the beauty and the dirt to life, creating sounds that are both polished and raw, modern yet vintage. This combination of warmth and unpredictability is the essence of OB-Xtreme’s appeal, allowing users to push digital synthesis into an expressive, almost organic realm. Each note can carry its own story, oscillating between clear, pristine tones and gritty, distorted textures.
In practical terms, these features make OB-Xtreme an invaluable tool for producers who crave analog authenticity. The Xtreme Factor provides a way to blend dirt into the sound at will, while voltage offsets give each voice a touch of individuality. Together, they create a deeply satisfying synthesis experience, where perfection is found not in uniformity, but in diversity—the way each voice dances, imperfectly yet beautifully, in harmony with the others.
In OB-Xtreme, the beauty and the dirt are more than just sound—they’re a philosophy. By embracing and celebrating these imperfections, OB-Xtreme opens a door to a more expressive, character-driven approach to synthesis.
You can check your current version with a right-click on the GUI.
Updates for OB-Xtreme 2.0 owners are free until version 4.0.
Get OB-Xtreme 3 for PC & MAC
| Machine | Format(s) | Architecture(s) | Native Processor(s) | OS Supported | Note |
|---|---|---|---|---|---|
| PC | VST3 | X64 | INTEL | Windows 10 or higher | |
| Mac | VST3, AU | X64 | INTEL/ARM | Mac OS-10.14 or higher |
OB-Xtreme 3.0 comes with both PC & Mac Installers
