Oberheim OB-X
Released: 1978
MSRP: $5995US
Synopsis:
Similar to a polyphonic OB-1 without dual slope filter, variable saw/triangle, or some modulations. Architecture Class: Conventional (subtractive).
Ebay Description:
The Oberheim OB-X is a 61 key, polyphonic analog synthesizer, featuring dual oscillators (with sync and FM), noise generator, resonant 12dB low pass filter, dual ADSR envelopes, an LFO, 32 presets, tape interface, and CV IO.
Physical
| Form Factor | Dimensions | Weight | Audio Input | Audio Output | Communication Port | Control Input | Control Output | Switch Input | Power |
|---|---|---|---|---|---|---|---|---|---|
| 61 keys | ? | ? | filter | mono left right | tape | CV gate | CV gate | sustain program+ | AC |
Interface
| Compatibility | Multitimbral Memory | Program Memory | External Storage | External Programming | UI Input | UI Output |
|---|---|---|---|---|---|---|
| - | no | 32 | no | no | knobs/buttons | LED |
Architecture
| Multitimbral | Polyphony | Unison | Architecture |
|---|---|---|---|
| 1 | 4|6|8 | yes | VCO1+VCO2+noise->VCF->VCA |
Output
| Effects | Pan Modulator | Volume Modulator | Headphone |
|---|---|---|---|
| no | no | VCA-EG pedal | no |
Control
| Arpeggiator | Arpeggiator External | Sequencer | Sequencer Memory | Sequencer External | Continuous | Program Change |
|---|---|---|---|---|---|---|
| no | N/A | no | N/A | N/A | BendLever ModLever filter:pedal volume:pedal vibrato:pedal | pedal |
Keyboard
| Key Pressure | Chord Memory | External Control | External Sustain | Key Scaling | Velocity Curves |
|---|---|---|---|---|---|
| no | no | CV gate | pedal | no | no |
Source
| Name | Signal Class | Waveform | Octave Range | Amplitude Modulator | Harmonics Modulator | Pitch Modulator | Wave Assign Modulator |
|---|---|---|---|---|---|---|---|
| VCO1 | analog | saw/triangle(variable) pulse | +-1 | no | FM:VCO2 PWM:LFO | LFO portamento BendLever | no |
| VCO2 | analog | saw/triangle(variable) pulse | +-1 | no | sync:VCO1 PWM:LFO | LFO portamento BendLever | no |
| Noise | analog | noise | - | no | no | no | no |
Filter
| Name | Signal Class | IC | Resonant | Shape | Frequency Modulator | Resonance Modulator | Shape Modulator |
|---|---|---|---|---|---|---|---|
| VCF | analog | discrete | yes | 12dB low pass | key LFO VCF-EG pedal | no | no |
Envelope
| Name | Level | Rate | Loop | Polarity | Trigger | Level Modulator | Rate Modulator |
|---|---|---|---|---|---|---|---|
| VCF-EG | sustain | attack decay release | no | no | no | no | no |
| VCA-EG | sustain | attack decay release | no | no | no | no | no |
LFO
| Name | Waveform | Delay | Polarity | Sync | Delay Modulator | Level Modulator | Rate Modulator |
|---|---|---|---|---|---|---|---|
| LFO | sine square random | yes | no | no | no | ModLever vibrato:pedal | no |
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