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The Oberheim OB-6 represents a monumental milestone in synthesizer history, marking the first and only historic collaboration between legendary instrument designers Tom Oberheim and Dave Smith. By pairing the unmistakable, lush sonic character of Tom Oberheim's classic Synthesizer Expander Module (SEM) engine with Dave Smith's modern, stable, and highly reliable instrument architecture, the OB-6 bridges the golden age of analog synthesis with contemporary studio demands. It stands as a premium, six-voice polyphonic powerhouse designed for musicians who demand raw, discrete analog warmth alongside effortless modern workflow integration.Core Architecture and Sound EngineAt the heart of the OB-6 is a fully discrete, all-analog signal path per voice. This architecture ensures an incredibly rich, organic, and powerful presence that digital instruments struggle to replicate.Discrete VCOs: Each of the six voices features two newly designed, true voltage-controlled oscillators (VCOs) plus a dedicated sub-oscillator per voice for massive low-end reinforcement.Continuously Variable Waveshapes: Unlike synths limited to fixed switches, the OB-6 allows users to seamlessly morph between sawtooth, pulse (with pulse-width modulation), and triangle waveforms. This capability unlocks an infinite spectrum of transitional timbres.The Legendary SEM Filter: The crown jewel of the OB-6 is its state-variable, resonant filter. Inspired directly by Tom Oberheim's original 1970s SEM, this 2-pole (-12dB per octave) filter can smoothly transition from low-pass, to notch, to high-pass modes, with an additional selectable band-pass mode. It provides a distinctly bright, brassy, and expressive texture that cuts through any mix.Modulation and Expression (X-Mod)The OB-6 features the highly versatile X-Mod (Cross-Modulation) system, which greatly expands its sound design capabilities beyond standard polyphonic synths.Flexible Sources: X-Mod utilizes the Filter Envelope and Oscillator 2 as modulation sources.Target Destinations: Users can route these sources to control Oscillator 1 frequency, Oscillator 1 pulse width, Oscillator 1 shape, Filter Cutoff, and Filter Mode.Sonic Variety: This matrix allows for the effortless creation of complex, metallic, and aggressive textures, including bell-like chimes, piercing cross-modulation effects, and evolving sci-fi soundscapes.Modern Control, Sequencing, and EffectsWhile the internal audio path is purely analog, the control systems are digital, bringing modern convenience to a vintage-flavored instrument.Knob-Per-Function Interface: The front panel features an intuitive layout with immediate physical control over almost every parameter, eliminating the need for tedious menu-diving.Advanced Polyphonic Sequencer: A built-in 64-step polyphonic sequencer allows players to record up to six notes per step, complete with rests and ties, syncing seamlessly to internal or external MIDI clock.Studio-Grade Dual Effects: The 24-bit/48kHz digital effects engine includes high-fidelity reverbs, delays (including bucket-brigade emulation), chorus, and flangers. Crucially, it features authentic digital recreations of Tom Oberheim's legendary Phase Shifter and Ring Modulator.True Analog Bypass: When the digital effects are turned off, a physical relay ensures a 100% pure, unadulterated analog signal path from the oscillators to the main audio outputs.Build and Form FactorsDesigned for both rigorous touring schedules and high-end studio environments, the OB-6 features a robust steel chassis adorned with premium walnut end cheeks and classic Oberheim-style pinstriping. It is available in two distinct form factors:The Keyboard Version: Features a premium, 4-octave, semi-weighted keybed that supports both velocity and channel aftertouch for highly expressive physical performances.The Desktop Module: A compact, space-saving tabletop unit that retains identical front-panel controls and internal circuitry, perfect for tight studio desks or integration with external MIDI controllers.