ARP Omni
Released: 1976
MSRP: $2450US
Synopsis:
Ensemble with monophonic (preset volume envelope) bass and "polyphonic" (divided oscillator) string and synth engines. Bass shares string and synth signal paths. Architecture Class: Conventional (subtractive).
Ebay Description:
The ARP Omni is a 49 key analog ensemble synthesizer, featuring monophonic bass, polyphonic string and synth sections, with dedicated outputs and chorus. Poly Synth section features a 24dB low pass filter and envelope. String section features an attack and release controls.
Physical
| Form Factor | Dimensions | Weight | Audio Input | Audio Output | Communication Port | Control Input | Control Output | Switch Input | Power |
|---|---|---|---|---|---|---|---|---|---|
| 49 keys | ? | 33lbs | no | high (XLR) low Synthesizer | no | CV:VCF pedal:VCF | gate:10V trigger:10V (2us) | sustain | AC |
Interface
| Compatibility | Multitimbral Memory | Program Memory | External Storage | External Programming | UI Input | UI Output |
|---|---|---|---|---|---|---|
| - | N/A | no | no | no | buttons/sliders | LED |
Architecture
| Multitimbral | Polyphony | Unison | Architecture |
|---|---|---|---|
| 3 | Bass:1 String:full PolySynth:full | no | VCO->VCF->VCA |
Output
| Effects | Pan Modulator | Volume Modulator | Headphone |
|---|---|---|---|
| chorus phase shifter | no | StringEG SynthEG | no |
Control
| Arpeggiator | Arpeggiator External | Sequencer | Sequencer Memory | Sequencer External | Continuous | Program Change |
|---|---|---|---|---|---|---|
| no | no | no | N/A | no | no | no |
Keyboard
| Key Pressure | Chord Memory | External Control | External Sustain | Key Scaling | Velocity Curves |
|---|---|---|---|---|---|
| no | no | no | pedal | no | no |
Source
| Name | Signal Class | Waveform | Octave Range | Amplitude Modulator | Harmonics Modulator | Pitch Modulator | Wave Assign Modulator |
|---|---|---|---|---|---|---|---|
| BassVCO | analog | square | 8' 16' (mix) | no | no | no | no |
| PolySynthVCO | analog | saw square | 4' 8' (mix) | no | no | no | no |
| StringVCO | analog | saw | 4' 8' (mix) | no | no | no | no |
Filter
| Name | Signal Class | IC | Resonant | Shape | Frequency Modulator | Resonance Modulator | Shape Modulator |
|---|---|---|---|---|---|---|---|
| SynthVCF | analog | 4075 | yes | 24dB low pass | CV LFO pedal SynthEG | no | no |
Envelope
| Name | Level | Rate | Loop | Polarity | Trigger | Level Modulator | Rate Modulator |
|---|---|---|---|---|---|---|---|
| SynthEG | sustain | attack decay release | no | no | key | no | no |
| StringEG | - | attack release | no | no | key | no | no |
LFO
| Name | Waveform | Delay | Polarity | Sync | Delay Modulator | Level Modulator | Rate Modulator |
|---|---|---|---|---|---|---|---|
| LFO | triangle? | no | no | no | no | no | no |
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