APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manuel d'utilisateur télécharger pdf (Page 24)

24 Parameters

In a real string, the material of the string will affect how it vibrates. For

example, a metal string will oscillate for a longer time than a nylon one; its

sound will also be brighter. In the String module, this behavior is adjusted with

the Damping and Decay knobs. The Damping knob is used to set the amount

of high frequencies in the string vibration, this amount being increased as the

knob is turned clockwise. The decay time of the vibrations is controlled with

the help of the Decay knob and it is increased by turning the knob clockwise.

Both of these parameters can be modulated with the pitch signal received from

the keyboard.

In a ﬁrst approximation, a string can be considered to be harmonic meaning

that its partials are located at frequencies equal to multiples of its fundamental

frequencies. Real strings, however, are more or less inharmonic depending mostly on the width of

the string. This characteristic of strings is adjusted with the Inharm knob. When the Inharm knob

is in its leftmost position, the string will be perfectly harmonic and turning the knob clockwise will

increasingly detune the partials toward higher frequencies.

The Release knob is used to adjust the ratio between the decay time of the oscillation of the

string when a note is depressed and when it is released. When the knob is in its leftmost position,

both decay times are the same and equal to the decay time determined by the settings of the Decay

knob. Turning this knob clockwise will decrease the decay time of the note when it is released

while keeping the decay time when the key is depressed to its current setting. Note that this control

constitutes an easy mean to reproduce the action of dampers on the string. When the Damper mod-

ule is used and the Release knob is turned clockwise, the effect of the both damping mechanisms

will add up.

Finally, the general level of the output signal from the String module is controlled with the

Level knob. This parameter is proportional to the output signal from the body instrument sent into

the distortion and the effects. It is therefore helpful to control the amount of distortion introduced

by this modules and the different effects.

4.2.2 The Exciter Module

The String module can be played using different types of exciters in order to reproduce different

types of instruments and playing techniques. The exciter is selected using the switches at the

top of the module. The choices available are from left to right Bow, Hammer 1, Hammer2 and

Plectrum. These different types of exciters share the same front panel but note that the names of

the parameters controlled by the different knobs vary for each exciter. We now review the different

exciter types in more detail.

Plectrum

The Plectrum exciter, illustrated in Figure 9, is used to play instruments such as guitars, harpsi-

chords or basses with a pick. The Plectrum can be viewed as an angled object placed under the

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manuel d'utilisateur Page 24