"You should never call a synthesizer 'polyphonic' simply because it can play several notes simultaneously. To earn this description, it must be able to shape each note using dedicated contour generators, VCFs and VCAs, and without deference to any notes that may already be sounding. There are two ways to accomplish this: firstly, you can use one or more envelope generators and filters for each note on the keyboard, which is the approach used in the Korg PS32xx series; secondly, you can restrict the number of notes that will sound simultaneously, and assign a more limited number of oscillators, filters, amplifiers, and envelopes to them as the notes are played, which is the approach used in almost every other polysynth. So, while the Quadra's polysynth section is polyphonic in the sense that you can press every note simultaneously, its single envelope generator, VCF, and VCA means that it can't articulate them correctly.
Roland coined the name 'Paraphonic' for this architecture, and it was used by many famous keyboards, including the Solina, the ARP Omni and Omni II, the Roland RS202 and RS505, the Korg Trident and Poly 800, the Moog Opus III, and the filter section on the Polymoog."
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