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AAS Chromaphone Manual

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4.5 The Resonator Module 27
The Release parameter is used to simulate the effect of dampers on the object when a note is
released. The release time is calculated as a percentage of the total decay time of the object as set
by the Decay parameter.
The Material control allows one to fix the decay time of partials as a function of frequency
with respect to that of the fundamental. This is a parameter characteristic of the material of the
object. When this parameter is set to a value of zero, all partials decay at the same rate, that fixed
by the position of the Decay control. Adjusting the Material control to a negative value favors low
frequencies by decreasing more and more the decay time of partials as their frequency increases.
When this control is set to a value of -1, the decay time will be inversely proportional to the
frequency of the partial. Thus a partial with a frequency twice as great as that of the fundamental
will have a decay twice as short as that of the fundamental, a partial with a frequency three time as
great will have a decay time three times shorter and so on. Using a positive value for this parameter
has an opposite effect as the low partials then decay more rapidly than the higher ones. When this
parameter is set to a value of 1, the decay time is proportional to the frequency of the partial. For
example, the decay time of a partial with a frequency twice as great as that of the fundamental will
have a decay twice as long as that of the fundamental and so on.
The Radius parameter replaces the Material control when a Tube object is selected. In fact,
standing waves in a tube do not result from the vibrations of the walls of the tube but rather by
vibrations of the air column inside the tube. The material of the tube is therefore not a relevant
parameter in that case. The effect of the Radius parameter can be viewed as that of a low-pass
filter with the cut-off frequency of the filter increasing as the radius is decreased. In other words,
the smaller the radius, the brighter the sound. The radius of the tube also affects the total decay
time of the object, the decay time being shorter for large radii as a result of larger radiation losses
at the open ends of the tube. The Radius control on the interface has been adjusted to follow the
same behavior as that of the Decay one, in other words to obtain longer decay time as it is turned
clockwise. Even if this may seem contradictory at first, this implies that the actual radius of the
object decreases has the value of the parameter is increased.
The Tone control is used to adjust the amplitude of the partials as a function of frequency with
respect to that of the fundamental. When this control is adjusted to a value of zero, all partials have
the same amplitude. When this control is set to a negative value, the high partials have a smaller
amplitude than the low ones. For example, a value of -6dB/octave results in the amplitude of the
partials being inversely proportional to their frequency. Thus a partial having a frequency twice
as great as that of the fundamental will have an amplitude twice as small (-6 dB), a partial with a
frequency four times that of the frequency will have an amplitude 4 times smaller (-12 dB) and so
on. When this control has a positive value, the effect is inverted. The low frequency partials then
have a smaller amplitude than the higher ones. For example, when this parameter is set to a value
of +6 dB/octave, the amplitude of the partial is proportional to its frequency. Thus a partial with
a frequency twice that of the fundamental will have an amplitude twice as great (+6 dB) as that
of the fundamental and so on. Note that these amplitude values can further be modulated by the
excitation position (see Hit Position control) which is a parameter affecting the relative amplitude
of the partials.
… 27 …


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