Sequential OB-6 Keyboard – 6-Voice Polyphonic Analog Synthesizer

The Sequential OB-6 Keyboard is a premium 6-voice polyphonic analog synthesizer born from the legendary collaboration between Dave Smith and Tom Oberheim. Combining the unmistakable warmth and character of the classic Oberheim SEM with modern performance features, the OB-6 delivers authentic vintage analog sound while offering the reliability and flexibility demanded by today's musicians, producers, and sound designers. Its intuitive knob-per-function interface provides immediate hands-on control, making sound creation fast and inspiring.

At the heart of the OB-6 are two discrete voltage-controlled oscillators (VCOs) plus a sub-oscillator per voice, paired with a genuine SEM-inspired 2-pole state-variable analog filter capable of Low-Pass, High-Pass, Band-Pass, and Notch modes. Additional features include stereo analog distortion, dual studio-quality digital effects, a 64-step polyphonic sequencer, arpeggiator, X-Mod, and 500 factory plus 500 user presets, making it equally suited for studio production and live performance.

Key Features

• Professional 6-voice polyphonic analog synthesizer

• Designed by Dave Smith and Tom Oberheim

• Full-sized 49-key semi-weighted keyboard with velocity and channel aftertouch

• Two discrete analog VCOs plus sub-oscillator per voice

• Authentic SEM-inspired 2-pole state-variable analog filter

• Fully analog signal path

• Stereo analog distortion

• Dual 24-bit/48 kHz studio-quality digital effects

• 64-step polyphonic step sequencer

• Built-in arpeggiator with multiple playback modes

• X-Mod section for advanced sound design

• Knob-per-function interface for instant control

• 500 factory presets and 500 user preset locations

Specifications

• Model: OB-6 Keyboard

• Product Type: Polyphonic Analog Synthesizer

• Polyphony: 6 Voices

• Keyboard: 49-Key Semi-Weighted with Velocity & Channel Aftertouch

• Oscillators: 2 Discrete Analog VCOs + 1 Sub-Oscillator per Voice

• Filter: SEM-Inspired 2-Pole State-Variable Resonant Analog Filter

• Effects: Reverb, Digital Delay, BBD Delay, Chorus, Flanger, Phase Shifter, Ring Modulator

• Sequencer: 64-Step Polyphonic

• Arpeggiator: Yes

• Preset Memory: 500 Factory + 500 User Programs

• Audio Outputs: Stereo 1/4" Left/Mono & Right Outputs

• Headphone Output: 1/4" Stereo

• Connectivity: MIDI In/Out/Thru, USB MIDI, Sustain Pedal Input, Expression Pedal Inputs, Sequencer Footswitch Input

• Power Supply: Internal Universal Power Supply (100–240V AC)

• Dimensions: 80.7 × 32.3 × 11.7 cm

• Weight: 9.5 kg

The Sequential OB-6 Keyboard combines the timeless sound of classic Oberheim analog synthesis with modern sequencing, effects, and performance features. Whether you're creating lush vintage pads, expressive brass, powerful basses, soaring leads, or cinematic textures, the OB-6 delivers an unmistakable analog sound that has become a modern classic.