Manual AAS Strum Electric GS-1 (page 51 of 98) (English)

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6.2 The Guitar Modules 51

6.2.4 The Palm-Mute Module

Palm muting is a technique used by guitar players to mufﬂe the strings slightly

while simultaneously playing the strings with the picking hand. It is obtained by

letting the side of the picking hand touch the strings just before the bridge.

In Strum, palm muting is achieved by using special strumming keys as ex-

plained in section 3.2. The resulting sound of this effect can be adjusted with

the help of the Tone knob. This parameter is used to control the amount of high

frequencies in the resulting sound; turning this knob to the left decreases the

amount of high frequencies relatively to low frequencies while turning it to the

right increases it.

6.2.5 The Pickups Module

The pickups of an electric guitar are an essential part of the instrument. They

are transducers able to capture the mechanical vibrations of the strings and transform

them into an electric current which is then routed to an ampliﬁer and speaker. An

electric guitar usually has two or more pickups located at different points on the body

each with its distinctive sound. Pickups can be activated individually or paired to

produce different tone colors.

A magnetic pickup consists of a permanent magnet wrapped into a coil of several

hundred turns. The vibrations of the metal strings close to the pickup result in a mod-

ulation of the magnetic ﬁeld surrounding the coil which induces an alternative current

in the wire of the coil. The electric signal from the pickup is sent to the ampliﬁer

via a simple electric circuit and a cable. The combined inductance, capacitance and

resistances of this circuit form a resonant low-pass ﬁlter whose cut-off frequency and volume can

be controlled through the use of potentiometer by the musician.

The Pickup module of Strum include two controls in the main view. The Selector control

allows one to select which pickup is activated. Available positions are neck (N), body (B) or both

simultaneously (+).

The Volume knob is used to adjust the overall level of the output from the guitar. It is important

to note that while changing the volume of the output signal does not affect the sound of the guitar

itself, it does affect the sound of the guitar, ampliﬁer chain. Indeed, a key element of the tonal effect

of the ampliﬁer is the distortion it introduces in the signal which strongly depends on the amplitude

of the input signal of the ampliﬁer. This means that adjusting the output level of the guitar to values

which are too high will result in an output signal from the ampliﬁer which is always distorted. In

order to maximize the dynamic range of the ampliﬁer, the output signal from the guitar should be

adjusted to the 0 dB mark on the level meter when playing at mezzo forte and when the ampliﬁer,

the spring reverb, and the cabinet are switched off.

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AAS Strum Electric GS-1 Manual

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