Sequential Prophet VS - Page 46

46
Figure 6-2 shows three types of oscillator frequency controls:
The rst type raises or lowers the pitch of all oscillators in all voices: for
example, Master Tune and the Pitch wheel.
The second type of frequency control aects each voice independently. The
keyboard signal corresponding to the position of the key being played controls
all four oscillators in the voice at the same time (as discussed above). Also, if
on, the lter envelope modulation source can also drive the voice pitch sharp
or at.
The third type of control aects each oscillator for completely independent
oscillator tuning or detuning within the voice itself, each oscillator has its own
coarse and ne initial frequency controls (or osets), and can be separately
modulated by either or both LFOs, and pressure. This makes possible a wide
spectrum of dynamic pitch- shifting techniques.
In addition to this highly-versatile frequency control system, the main
dierence between these oscillators and those of previous Prophets is that
the waveforms of these digital oscillators are held in computer memory. (The
memory system was discussed in Section 3.) Up to 128 dierent waveforms
Figure 6-2
OSCILLATOR FREQUENCY CONTROL
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