Manual AAS Strum Acoustic GS-1 (page 48 of 91) (English)

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48 Parameters

The Global, Pick/Fingers, Strings, Hammer, Mute and Palm modules are related to the

modeling of the individual strings of the guitar. The Body module on the right of the guitar shape

represents the body of the guitar and allows one to adjust its behavior. 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 acoustic guitar most of the sound we hear is radiated from the body

of the instrument. The strings themselves radiate just a small amount of sound

directly but it is their vibrations that are transmitted to the body of the guitar,

through the bridge, where they can be radiated efﬁciently. It is also the strings

that ﬁxes the pitch of the sound we hear depending on their effective lengths.

In a real guitar, the material of the sting affects the sound of the instru-

ment. For example, the sound of a metal string is brighter than that of a nylon

one. The Tone knob controls the decay time of high frequencies in the sound

relatively to that of low frequencies which is a parameter related to the ma-

terial of the string. Turning this knob clockwise enhances high frequencies

resulting in a more metallic 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 6.6.1

hence the name of this knob.

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AAS Strum Acoustic GS-1 Manual

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