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4.2 The Edit View 29

The physical parameters of the Finger can be varied with both the Mass

and Stifness knobs which ﬁx respectively mass applied on the string and the

stiffness of the termination. Note that the Mass parameter can be modulated

by both the pitch and velocity signal from the keyboard. The termination can

further be characterized by the stiffness of the fret on which the string, pushed

by the ﬁnger, is applied. This parameter is controlled by the Stiff knob under

the Fret label.

Stiffness

Mass

Fret

String

Finger

Figure 13: The ﬁnger/fret interaction

4.2.6 The Geometry Module

The Geometry module is used to set the location of the point of action of

both the exciter and the damper on the string. These positions are adjusted with

the Position knobs under the Exciter and Damper labels and can be set to any

value between zero (the point of ﬁxation of the string) and half the length of

the string (value of 0.5).

When the Abs (absolute position) switch is on, the position of the exciter

or the damper is ﬁxed whatever the note played. This would be the case, for

example, on a guitar when the player keeps the position of the pick ﬁxed while

varying the effective length of the string when changing notes. The actual

position is determined with the setting of the Position knob applied to the length

of a string corresponding to C3 (middle C). Note that when the note played is

such that the string length corresponding to this note is shorter than this position, the exciter or the

damper will follow the ﬁxation point of the string.

When the Abs switch is in its off position, the location of the damper or the exciter is changed

in order to always correspond to a certain fraction of the length of the string. This fraction of the

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manuale Utente Pagina 29