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24 Parameters
Low
Medium
High
Low
Medium
High
Time
Time
Stiff
Vol
Figure 9: Effect of the Stiffness and Volume knob on the output from the Mallet module.
amount of noise. The frequency content of the noise can be adjusted with the help of the Color
control. Turning this knob clockwise increases the cut-off frequency of a high-pass filter.
4.4 The Noise Module
The Noise module is an alternate way to excite the
resonator. This module can be used to add noise to the
impact signals from the Mallet module but, with its as-
sociated envelope generator, it also allows one to produce
long excitation signals very different from the impact-like
signals from the Mallet module.
The source of this module is a white noise generator whose output can be filtered using the
different filters available from the drop-down list at the top of the module. Available filter types are:
resonant low-pass, resonant high-pass, band-pass, and low-pass and high-pass in cascade allowing
for a flat response in the pass band.
The volume control is used to control the maximum amplitude of the source, the overall am-
plitude of the output signal from this module being controlled with the Noise Envelope module.
This parameter can further be modulated with the pitch or velocity signal from the keyboard or
with the output from the LFO module. The Frequency control is used to adjust the cut-off or cen-
ter frequency depending on the type of filter used to shape the noise source. This parameter can
be modulated with the the pitch or velocity signal from the keyboard or with the output from the
Noise Envelope or LFO module. The third control for this module has different values depending
on the type of filtering applied to the noise source. When a resonant filter is chosen, the label for
this parameter is Q and the parameter controls the resonance or quality factor of the filter. In the
case where a combination of low-pass and high-pass filter is chosen, the label is Width and the
parameter controls the width of the pass-band of the resulting filter.
The last parameter of the module is called Density and it is used to control the rate at which
random samples are fired by the module. When this control is in its left position, the density is low
and one can clearly hear individual random clicks. Increasing the noise density by turning the knob
clockwise increases the number of clicks generated in a given interval of time until the output starts
24


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