User Manual

13
Prophet 12 Operation Manual
Oscillators
When Triangle is the selected shape, the width of the wave is changed,
similar to Pulse and Sawtooth, adding harmonics and getting more thin
sounding when turned in either direction from 0.
With Sine as the selected shape, values less than 0 gradually add another
sine an octave higher than the base pitch. Values greater than 0 cause
the sine wave to gradually be clipped, adding harmonics and sounding
somewhat distorted.
For the 12 wavetable shapes, shaPe moD/PUlse wiDth crossfades
between the selected shape and the Wave Left and Wave Right selec-
tions. Let’s say, for example, that the selected wave shape is Mellow,
Wave Left is set to Tines, and Wave Right is set to Nasal. A shaPe moD/
PUlse wiDth setting of -64 will be the Tines wave, 0 will be Mellow, and
+63 will be Nasal. Values between -64 and 0 will be a mix of Tines and
Mellow; values between 0 and +63 will be a mix of Mellow and Nasal.
An extremely broad variety of hybrid wave shapes can be created by
mixing two of the wavetable shapes. And, of course, shaPe moD/PUlse
wiDth is a modulation destination, so an LFO or other modulation source
can be routed to it. Note that the algorithm used to mix the waves is not
simply a mix. If all three are set to the same wave, there will still be a
noticeable difference in the sound as Shape Mod changes.
shaPe moD/PUlse wiDth also works when noise is the selected shape.
With a Shape Mod value of 0, the displayed noise type is what is heard.
Values less than 0 gradually cause it to change to a second noise type.
Values greater than 64 cause it to change to a third noise type. The left
and right noise sources are xed. Try it. It’s much easier to hear than to
explain! The display also provides a visual indication of the change.
Wave Left, Wave Right—Sets the wavetable shapes used in conjunc-
tion with the shaPe moD/PUlse wiDth parameter. Wave Left and Wave
Right are only active when one of the twelve wavetables is selected as
the primary oscillator shape. See “Shape Mod/Pulse Width” for more
information.
Pitch: C 0…C 10—Sets the base oscillator frequency over a 10-octave
range, from 8 Hz to 8KHz, stepping in semitones. C3 is middle C, the
rst octave is 0 (C0, C#0, etc.), the second octave is 1 (C1, C#1, etc.),
and so on.