Sequential OB-6

OB-6 Specifications

Oscillators:

Two discrete VCOs per voice

Infinitely crossfadeable waveforms (sawtooth, variable-width square plus triangle for oscillator 2) per oscillator

Adjustable pulse width per oscillator

Hard sync: oscillator 1 synchronises with oscillator 2

Square wave sub-octave generator (oscillator 1) per voice

LFO mode (oscillator 2)

Switchable keyboard tracking (oscillator 2)

Adjustable detuning of the oscillators for increased tuning instability, from subtle to extreme

Mixer:

Amount/proportion oscillator 1

Amount/proportion sub-octave oscillator 1

Amount/proportion oscillator 2

Amount/share white noise

State variable filter

Two-pole, resonant filter per voice with low, high, bandpass and notch functionality, inspired by the original Oberheim SEM filter

Amount/proportion of the bipolar envelope generator

Modulation of the envelope intensity via the velocity response

Keyboard tracking: off, half intensity, full intensity

Filter envelope:

Four-stage envelope generator (ADSR)

Modulation of the envelope intensity via velocity

Volume envelope:

Four-stage envelope generator (ADSR)

Modulation of the envelope intensity via the velocity response

LFO:

Five waveforms: Sine, sawtooth, inverted sawtooth, square and random (sample and hold)

Clock synchronisation (to an internal or external MIDI clock)

Initial modulation intensity

Modulation targets: Frequency of oscillator 1 and 2, pulse width of oscillator 1 and 2, filter onset frequency, filter mode and amplifier.

Cross modulation (X-Mod)

Sources: Filter envelope (bipolar) and oscillator 2 (bipolar)

Targets: Frequency, waveform and pulse width of oscillator 1, filter cutoff frequency and filter mode, normal to bandpass filter

Aftertouch:

Source: Channel aftertouch (mono) with bipolar intensity control

Destinations: Oscillator 1 and 2 frequency, LFO intensity, volume envelope and filter envelope travel and filter mode

Clock:

Master clock with tap tempo

BPM control and display

MIDI clock synchronisation

Arpeggiator:

Selectable note values: sixteenth note, eighth note triplet, eighth note, dotted eighth note, quarter note

One, two or three octave ranges

Operating modes: up, down, oscillate, random, assignable

Sequencer:

Polyphonic step sequencer with up to 64 steps and support for pauses

Effects:

Analogue stereo distortion

Double digital effects in 24 bit/48 kHz. Available for selection: Reverb (room, hall, plate, spring), delay (digital with full bandwidth, and emulated bucket brigade circuit), chorus, flanger, phaser and ring modulator

Delay synchronisation

True bypass ensures a completely analogue signal path when digital effects are switched off

Performance control:

Full-format, lightly weighted 4-octave premium keyboard from Fatar with velocity response and aftertouch

Illuminated pitch and modulation wheels

Pitch wheel with centring spring and selectable range per programme (1 to 12 semitones up and down).

Transpose buttons with a range of eight octaves

Hold button locks played notes

Polyphonic portamento

Unison mode (monophonic) with configurable number of voices, from one to all six voices, chord memory and several modes for voice distribution

Manual button: When switched on, the control panel is active. Here you can hear the exact sound of the current settings of the controls.

Programme memory:

500 user and 500 factory sounds in ten banks with 100 programmes each

Direct programme access, including one-button access to the current set of ten programmes

Connections:

Left/mono and right output (2 x 6.35 mm jack socket)

Headphone output (6.35 mm stereo jack socket)

MIDI connections: In, Out, Thru

USB port for bidirectional MIDI communication

Expression pedal input for controlling the filter frequency

Expression pedal input for volume control

Sustain pedal/foot switch input

Footswitch input for the start/stop function of the sequencer

Power supply:

IEC AC input for the internal power supply unit

Can be operated worldwide with voltages from 100 to 240 volts at 50 to 60 Hz; maximum power consumption 30 watts

Physical specifications:

Walnut side mouldings

Dimensions: L x W x H (80.7 cm x 32.3 cm x 11.7 cm)

Weight: 9.5 kg