ARP Quadra

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Quadra by ARP Instruments, Inc.
Synthesis type:		Analog
Polyphony:		1 (Bass), 2 (Lead), All (String, Polysynth)
Oscillators:		2 (Lead)
Multitimbral:		4
VCA:		ADSR
LFO:		Sine, Square
Keyboard:		61-key Velocity, Aftertouch
External control:		CV/Gate, ARP system interface
Onboard effects:		1
Produced:		1978 - 1981

The ARP Quadra is an Omni, Odyssey and a few other Synths in one box. It has 4 sections: Poly Synth, Lead Synth which is duophonic like the Odyssey, Bass which is on the bottom two octaves like the Omni and Strings which are the same as an ARP Omni. There are 16 memory locations, but they are not proper memories. They simply recall which parameters are active so you still have to do plenty of tweaking. Like the Moog Polymoog keyboard, the Quadra was not a truly polyphonic. It used divided-down circuits for the Omni Part, and there is no Portamento or Cross-Modulation. It only has one VCF and VCA for the Poly Synth section. It has a simple and useful arpeggiator for the lead section. The Quadra uses the typical ARP orange and black color scheme.