Manual AAS Strum Acoustic GS-1 (page 57 of 91) (English)

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6.6 Edit Mode 57

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 polari-

ties. Both of these components exist but completely independent of

each other resulting in a sound with no beating and a regular decay

envelope. The Balance knob is used to control the mix between both

polarities in the output sound. In its leftmost position, one only hears

polarity A while in its rightmost position only polarity 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.

In a real string, the material of the string affects how it vibrates. For example, a metal string

oscillates for a longer time than a nylon one; its sound also contains more high frequencies and is

brighter. This behavior is adjusted with the Tone and Decay knobs. 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. As a rule of thumb a nylon string is obtained by setting the Tone knobs to the

left position and using a low decay time. Turning these knobs to the right and increasing the decay

time results in a more metallic sound.

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.

When these knobs are turned fully to the left, the string vibration is perfectly harmonic. Turning

the knobs clockwise increasingly detunes the partials toward higher frequencies resulting in a more

dissonant sound.

The Gauge parameter is used to set the amount of coupling between the string and the body

of the guitar which determines how efﬁciently vibrations from the string are transmitted to the

body of the instrument. Physically, this amount of coupling is determined by the ratio between the

impedance of the string and that of the body at the bridge. The mass per unit length and tension of

a string determine its impedance. As in a guitar all the strings have more or less the same tension,

this impedance of the string is mainly determined by the gauge of the string. Turning the Gauge

knob clockwise increases the gauge of the string and thereby its coupling with the body resulting

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AAS Strum Acoustic GS-1 Manual

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