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ARP Quartet Synthesizer Keyboard

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Description
The Seil Orchestra was bought by ARP Instruments to be slightly modified, relabeled and then sold as the ARP Quartet. This version replaced the Reed section with an Organ one, however aside from that the synthesizer was almost identical.

The original Orchestra was very limited but still a very characteristic instrument for its time. It produces its sounds from a divide-down oscillator network and therefore has 49 note (unlimited) polyphony.

Although it contains 4 sections of presets (Brass, Strings, Reed and Piano), each which contain two sounds, the only parameters that can be edited are Vibrato (LFO), Brilliance (for the Brass, which also has a separate 'Brass Attack'), Attack and Decay. This ultimately means that the Orchestra cannot produce many different sounds; however because of its Italian origin and its distinctive routing, the Orchestra sound is not matched by any other similar synthesizers.

Official ARP Product Copy

The new ARP Quadra is the fastest user-presettable poly- phonic synthesizer in the world. offering the performing musician overwhelming sonic capabilities from a single keyboard. The name Quadra is derived from the fact that the instrument is actually four separate synthesizers in one microprocessor-controlled system. The instrument gives the musician the ability to write, edit. store. and activate the sounds of four synthesizers in live performance.

The Quadra's four sections are: a bass synthesizer. string synthe- sizer, polyphonic synthesizer. and two-voice, touch-sensitive lead synthesizer. A stereo, voltage- controlled phase shifter is also in. cluded, designed for the Quadra's special requirements. The bass synthesizer can be programmed to control the two lower octaves of a five-octave split keyboard. ranging from electric to string bass settings.

The string synthesizer produces the rich, deep string sounds for which ARP is famous. and can be used with the built-in phase shifter for exceptionally dramatic string choruses.

The poly/synthesizer section provides the musician with a quick change of envelope control param- eters at the touch of a switch. Brass, piano and synthesizer sounds can be processed through the phase shifter. sample/hold and other circuits for a variety of poly- phonic synthesizer and keyboard effects.

The lead synthesizer section is actually a two-note. lead-line vari- able synthesizer. with pressure- sensitive (second touch) control of dynamics over three octaves. and full five-octave range when the bass synthesizer section is not in use.

The Quadra's lead capability includes twin-channel portamento and. coupled with a microproces- sort allows intervals and octaves to be programmed from the key- board in real time. A built-in sequencer permits instant sequen- tial effects which follow every key deDressed. The se uence can he new ARP Quadra is the fastest user-presettable poly- phonic synthesizer in the world. offering the performing musician overwhelming sonic capabilities from a single keyboard. The name Quadra is derived from the fact that the instrument is actually four separate synthesizers in one microprocessor-controlled system. The instrument gives the musician the ability to write, edit. store. and activate the sounds of four synthesizers in live
performance.

The Quadra's four sections are: a bass synthesizer. string synthe- sizer, polyphonic synthesizer. and two-voice, touch-sensitive lead synthesizer. A stereo, voltage- controlled phase shifter is also in. cluded, designed for the Quadra's special requirements. The bass synthesizer can be programmed to control the two lower octaves of a five-octave split keyboard. ranging from electric to string bass settings. The string synthesizer produces the rich, deep string sounds for which ARP is famous. and can be used with the built-in phase shifter for exceptionally dramatic string choruses.

The poly/synthesizer section provides the musician with a quick change of envelope control param- eters at the touch of a switch. Brass, piano and synthesizer sounds can be processed through the phase shifter. sample/hold and other circuits for a variety of poly- phonic synthesizer and keyboard effects.

The lead synthesizer section is actually a two-note. lead-line vari- able synthesizer. with pressure- sensitive (second touch) control of dynamics over three octaves. and full five-octave range when the bass synthesizer section is not in use.

The Quadra's lead capability includes twin-channel portamento and. coupled with a microproces- sort allows intervals and octaves to be programmed from the key- board in real time. A built-in sequencer permits instant sequen- tial effects which follow every key depressed. The sequence can be memorized and held while the keyboardist plays additional string and polyphonic lines on top of the latched sequence.

At the heart of the Quadra is a computer programmer. a device which unites preset and variable synthesizer technology Prior to a performance, the musician sets up the desired sounds in each section and stores these sounds into any of 16 programmable positions. The sounds are memorized and can then be recalled by touch. Each section of the Quadra is individually programmable and mixable through the output mix- ing controls centrally located on the control panel. Additional syn- thesizers can be interfaced with the Quadra through ARP systems interface jacks. Pedal and foot- switch control inputs for a variety of Quadra functions are easily accessible on the back panel.
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Technical Specifications
Type: Analog
Synthesis: Divide Down, Subtractive
Oscillators
Oscillators: 2
Oscillator Notes:
Tones: Brass, Organ, Strings, Piano
Envelopes
Envelopes: 2
Evelope Paramerters: Attack, Decay
Envelope Notes::
Brass Attack
String Attack and Decay
Filters
Filters: 1
Types: 24dB Slope (4-pole), Low Pass, Resonance
LFO
LFO: 1
LFO Parameters: Triangle
Polyphony & Tuning
Polyphony: 49
Timbrality: 2
Tuning: Standard
Patches
Patches RAM: 4
Storage: Internal
Case
Case: Keyboard
Keyboard: 49 keys, Non-weighted, Plastic
Controls: Faders
Connections
Audio Output Connections: 1/4" Phone Jack
Audio Output Notes: 1 Mono 1/4" TR
Inputs: 1 Mono 1/4" TR
Power: 120 V AC
Production
Year Released: 1979
Year Discontinued: 1980
Used By
808 State, Massive Attack
Reviews
Pricing
MSRP List Price: $1350 - convert
Retail Street Price: $1200 - convert
Used Price: $500 - $1500 - convert
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References & Sources

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