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6.2 The Guitar Modules 49
The Pick/Fingers, Strings, Hammer-On, Palm-Mute modules are related to the modeling of
the individual strings of the guitar. The Pickups module on the right of the guitar shape represents
the action of pickups and allows one to ajdust their volume and select different combinations of
pickup positions. The different knobs in this view are so-called offset knobs. Each of them is
related to a specific parameter of the strings or body of the instrument. They are used to vary
the value of a parameter around its current value, in other words the value visible when selecting
individual strings. In the case of the strings parameters, these offset knobs alter the value of the
same parameter for the six strings at once.
Note that after varying parameters with these offset knobs, it is possible to apply the changes
to the parameters. This is done by clicking on the down-pointing arrow located on the right of
the module labels and selecting the Apply Offset command. This will add the offset value to the
current value of the parameter, move back the offset knob to its center position and update the knob
position in the individual string views.
6.2.1 The Strings Module
In an electric guitar, it is the vibration of the strings which is
captured by the pickups and converted into an electric current.
It is also the strings that fixes the pitch of the sound we hear
depending on their effective lengths.
The Tone knob controls the decay time of high frequencies
in the sound relatively to that of low frequencies which is a pa-
rameter related to the material of the string. Turning this knob
clockwise enhances high frequencies resulting in a more metal-
lic sound while turning the knob anti-clockwise has a damping
effect on high frequencies.
Strings are usually considered to be harmonic meaning that all the frequency components of
the sound appear at frequencies that are multiple integers of the fundamental frequency of the note
being played. Real strings, however, are not perfectly harmonic due to the fact that there width is
not exactly constant along their entire length. As the inharmonicity is increased, we will say that
the sound becomes more and more dissonant. In Strum, the amount of inharmonicity in the sound is
controlled using the Inharm knob. Turning this knob clockwise detunes the partials toward higher
frequencies while turning it anti-clockwise reduces the inharmonicity of the strings.
The Coupling knob is used to control the amount of beating in the sound. Turning this knob
to the right increases the amount and frequency of the beating while turning it to the left reduces
it. This beating effect is characteristic of real guitar strings, it is due to the coupling between two
different components in the motion of the string as will be explained in more details in Secion 6.5.1
hence the name of this knob.
49


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