Manual AAS Strum Electric GS-1 (page 57 of 98) (English)

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6.5 Edit Mode 57

Finally, note that some of the parameters are framed by a lighter color background. This simply

means that these parameters can be controlled from the general view obtained when clicking on the

All button.

6.5.1 The Strings Module

The vibrational motion of a string can be decomposed into two different components, one perpen-

dicular to the plane of the body of the guitar and the other one parallel to that plane. At the bridge,

the string is ﬁxed and energy is transfered to the body of the guitar but also exchanged between

these two components of the string motion. This exchange is responsible for both the characteristic

beating effect present in the sound of the guitar and the typical decay curve or envelope of the

sound. Both these motion components are modeled in Strum and they are referred to as polarity A

and B.

For each polarity, one can adjust three parameters called Decay,

Tone and Inharm. The Coupling knob is used to adjust the amount of

energy exchanged between the two polarities of the string motion.

Turning this knob clockwise increases the coupling and therefore

the amount and frequency of the beating in the sound. When this

knob is in its leftmost position, there is no coupling between the two

polarities. Both of these components exist but completely indepen-

dent of each other resulting in a sound with no beating and a regular

decay envelope. The Balance knob is used to control the mix be-

tween both polarities in the output sound. In its leftmost position,

one only hears polarity A while in its rightmost position only polar-

ity B is heard. In its middle position, an equal mix of both is heard.

In general, to get the most realistic realistic sound, the knob should be turned toward the left or

in other words one should listen more to polarity A. This is because in a real guitar, vibrational

motion perpendicular to the body is more efﬁciently transmitted. Interesting effects can however

be obtained by mixing both polarities. Note that even when the balance knob is fully turned to the

left, coupling between both polarities is still taken into account as soon as the Coupling knob is

turned to the left which will introduce beating in the sound of polarity A. The Volume kbob is a

gain knob which is used to adjust the volume of individual strings.

The Tone knobs are used to set the respective amount of high frequencies in polarity A or B

of the string motion with respect to low frequencies. In their leftmost position, the decay time of

high frequencies in the sound is lower than that of low frequencies; in their rightmost position it is

longer. The overall decay time of the vibrations is controlled with the help of the Decay knobs and

it is increased by turning the knobs clockwise.

In a ﬁrst approximation, the strings of a guitar can be considered to be harmonic meaning that

their partials are located at frequencies equal to multiples of its fundamental frequencies. Real

strings, however, are more or less inharmonic depending on the homogeneity of the strings along

their length. This characteristic of strings is adjusted, for polarities A and B, with the Inharm knobs.

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AAS Strum Electric GS-1 Manual

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