Dave Smith Instruments PRO 2 - Manual (Page 27)

17 Pro 2 Operation Manual Oscillators
Shape Mod/Pulse Width: -64…0…63 —Causes the wave shape to be
altered. How it changes depends upon the selected shape. A setting of 0
is the default, unaffected shape.
When Sawtooth is the selected shape, S
hape
m
od
/p
ulSe
w
idth
controls
the symmetry of the wave, similar to pulse width on the Pulse wave.
S
hape
m
od
/p
ulSe
w
idth
affeccts the pulse width or duty cycle of the
Pulse wave.
0
Pulse Width
-64 63
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 wavetable shapes, S
hape
m
od
/p
ulSe
w
idth
crossfades between
the selected shape and the Wave Left and Wave Right selections. 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 S
hape
m
od
/p
ulSe
w
idth
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.
A broad variety of hybrid wave shapes can be created by mixing two
of the wavetable shapes. S
hape
m
od
/p
ulSe
w
idth
is also 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.