Sequential Prophet VS - Page 44

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static and the actual synthesis has largely depended on the lter and amplier
modules as modulated by the envelopes and other modulators.
However, in the Prophet VS the oscillator module itself is capable of producing
new, interesting, and lively timbres. Instead of voltage- controlled oscillators,
the Prophet VS uses digitally-generated oscillators which can use any wave-
form stored in its memory.This approach allows these oscillators to assume a
much larger role in the synthesis due to the specic way that the waveforms
in computer memory can be selected, modied, and precisely mixed in "real"
time (that is, as you play). (This actually occurs with the assistance of some
special, Sequential-designed integrated circuits.)
Refering to Figure 6-1, there are four oscillators in the voice. The pitches of all
four oscillators "track" the keyboard. The oscillators produce four separate,
continuous tones, which are combined into one signal by the oscillator mixer.
There are two ways to adjust the mixture of the four oscillators while the note
is being played: physically, using the joystick: or electronically, using the mixer
envelope generator or other modulation sources. Although the mixer system
is conceptually very simple, it is capable of producing extremely complex
timbres as either the joystick or modulators vary the mixture dynamically. This
is the essence of "Vector Synthesis."
Figure 6.1
General Block Diagram
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