ARP Quadra
Quadra
Released: 1978
MSRP: $3700US
Synopsis:
Ensemble synth with 4 synth engines (combination of Solus and Omni)
Architecture Class: Conventional (subtractive).
Ebay Description:
The ARP Quadra is a 61 key (pressure sensitive), analog ensemble synthesizer, featuring monophonic bass, duophonic Lead, polyphonic string and synth sections, with dedicated outputs. Bass, Lead, and Poly Synth sections feature 24dB low pass filters and envelopes. String section features an amplifier envelope. Lead section features an LFO. Bass and Lead sections feature CV/Gate/Trigger inputs/outputs. String and Bass sections also feature chorus.
Physical
Form Factor
Dimensions
Weight
Audio Input
Audio Output
Communication Port
Control Input
Control Output
Switch Input
Power
61 keys
?
?
mixer
mono (TS/XLR)
stereo outputs
4 dedicated outputs (lead, synth, string, bass)
no
BassCV:1V/oct
BassGate:2.5Vmin
LeadCV:1V/oct
LeadGate:2.5Vmin
Trigger:8V (10us min)
LeadFilterPedal
PolyFilterPedal
VolumePedal
BassCV:1V/oct
BassGate:10V
LeadCV:1V/oct
LeadGate:10V
Gate:12V
Trigger:10V (60us)
portamento
sustain:Lead
sustain:Poly/String
AC
Interface
Compatibility
Multitimbral Memory
Program Memory
External Storage
External Programming
UI Input
UI Output
-
no
16
no
no
buttons/sliders
LED
Architecture
Multitimbral
Polyphony
Unison
Architecture
4
Bass:1
Lead:2
String:full
PolySynth:full
no
VCO->VCF->VCA
Output
Effects
Pan Modulator
Volume Modulator
Headphone
chorus (strings/bass)
phase shifter (0.1-5Hz, S/H destination)
no
pressure
BassEG
LeadEG
PolySynthEG
StringEG
LFO
pedal
no
Control
Arpeggiator
Arpeggiator External
Sequencer
Sequencer Memory
Sequencer External
Continuous
Program Change
up and/or down
no
no
N/A
no
TouchSensor
no
Keyboard
Key Pressure
Chord Memory
External Control
External Sustain
Key Scaling
Velocity Curves
channel
no
CV
Gate
Trigger
yes
1
no
Source
Name
Signal Class
Waveform
Octave Range
Amplitude Modulator
Harmonics Modulator
Pitch Modulator
Wave Assign Modulator
BassVCO
analog
pulse
16'
8'
no
PWM
TouchSensor:+3semitones
no
LeadVCO1
analog
pulse
saw
-
no
PWM
pressure
LFO
portamento:1.5s/oct
TouchSensor:+3semitones
no
LeadVCO2
analog
pulse
saw
-
no
PWM
pressure
LFO
portamento:1.5s/oct
TouchSensor:+3semitones
no
PolySynthVCO
analog
saw
square
8'
4'
no
no
no
no
StringVCO
analog
saw
square
8'
4'
no
no
portamento
no
Filter
Name
Signal Class
IC
Resonant
Shape
Frequency Modulator
Resonance Modulator
Shape Modulator
BassVCF
analog
4075
yes
24dB low pass
16Hz-16kHz
key
no
no
LeadVCF
analog
4075
yes
24dB low pass
16Hz-16kHz
pressure
key
LeadEG:8oct
pedal
no
no
PolySynthVCF
analog
4075
yes
24dB low pass
16Hz-16kHz
key
LFO:+-1oct
PolySynthEG:8oct
pedal
no
no
Envelope
Name
Level
Rate
Loop
Polarity
Trigger
Level Modulator
Rate Modulator
BassEG
-
decay:5s
no
no
no
no
no
LeadEG
sustain/bp
attack:1s
decay:0.4/2s
attack:1s
release:2.5s
no
no
no
no
no
PolySynthEG
sustain
attack:1s
decay:2s
release:3s
no
no
no
no
no
StringEG
-
attack:6s
release:1/3s
no
no
no
no
no
LFO
Name
Waveform
Delay
Polarity
Sync
Delay Modulator
Level Modulator
Rate Modulator
LFO
sine
square
no
no
no
no
no
no
S/H
random
no
no
no
no
no
no
