Oberheim OB-Xa
OB-Xa
Released: 1981
MSRP: $5995US
Synopsis:
Duo-timbral with several updates (12|24dB filter, swap cross-mod for env mode)
Architecture Class: Conventional (subtractive).
Ebay Description:
The Oberheim OB-Xa is a 61 key, polyphonic duo-timbral analog synthesizer, featuring dual oscillators (with sync), noise generator, resonant 12dB or 24dB low pass filter (CEM3320), dual ADSR envelopes, an LFO, 120 presets, chord memory, tape and proprietary interfaces.
Physical
| Form Factor |
Dimensions |
Weight |
Audio Input |
Audio Output |
Communication Port |
Control Input |
Control Output |
Switch Input |
Power |
| 61 keys |
W:40in (101.6cm)
D:20in (50.8cm)
H:6in (15.24cm)
|
45lbs |
filter |
mono left right |
tape computer:proprietary |
no |
no |
sustain program+ hold |
AC |
Interface
| Compatibility |
Multitimbral Memory |
Program Memory |
External Storage |
External Programming |
UI Input |
UI Output |
|
- |
16 (split:8 layer:8) |
120 |
no |
computer:proprietary |
knobs/buttons |
LED |
Architecture
| Multitimbral |
Polyphony |
Unison |
Architecture |
| 2 |
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
vibrato:pedal |
pedal |
Keyboard
| Key Pressure |
Chord Memory |
External Control |
External Sustain |
Key Scaling |
Velocity Curves |
| no |
yes |
computer:proprietary |
pedal |
no |
no |
Source
| Name |
Signal Class |
Waveform |
Octave Range |
Amplitude Modulator |
Harmonics Modulator |
Pitch Modulator |
Wave Assign Modulator |
| VCO1 |
analog |
saw
pulse |
+-1 |
no |
PWM:LFO |
LFO
portamento
BendLever |
no |
| VCO2 |
analog |
saw
pulse |
+-1 |
no |
sync:VCO1
PWM:LFO |
LFO
VCF-EG
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 |
CEM3320 |
yes |
12|24dB 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 |
