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AAS Strum Electric GS-1 Manual

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6.5 Edit Mode 61
6.5.6 The Pickups Module
The Pickups module simulates the action of the pickups on the
guitar. There are two pickups in Strum, labeled Neck and Bridge,
which can be adjusted in various ways in order to obtain tonal col-
ors of different guitar types. They are activated by using the N, B
or + selector on the main view of the interface as explained in sec-
tion 6.2.5.
The Type selector allows one to choose between single coil or
humbucker pickups by clicking on the S or H button respectively.
Single coil pickups are made, as their name suggest, from a single
coil wounded around a permanent magnet. While this type of pickup
sounds great it has the disadvantage on a real guitar that it transmits,
in addition to the signal from the vibrating string, mains hum at the frequency of the mains alter-
nating current. In order to overcome this effect a clever device, known as the humbucker pickup,
was developed. Basically, a humbucker pickup consists of two single coil pickups with opposing
windings and polarities wired in series. This arrangement results in a reduction of the ambient
noise by destructive interference while the signal from the strings is amplified due to constructive
interference. But noise reduction is not the only effect of using two coils. This configuration also
changes the tone of the pickup which is responsible for the characteristic tone of specific guitar
types. Humbucker pickups typically produce a “warm” and “fat” tone while single coil pickups
usually sound “brighter” and “clearer”.
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. The quality factor and the cut-off frequency of this circuit can be adjusted for each
pickup using the Freq and Res knobs respectively allowing one to further adjust the tone of the
guitar signal.
The position of each pickup can also be adjusted from bridge to neck position using the Pos
knob. Using the M or mid position allows to position the pickup halfway between the bridge and
the neck. It is common, in different guitar types to listen to a single pickup at each of these position
or to mix the signal from the bridge and neck pickups or to combine one of these with the signal
from a third one positioned in the middle. On a real guitar, one can choose between these different
configurations using switch on the body of the instrument.
Finally, another parameter which affects the sound of the guitar is the relative amplitude of the
signal from each pickup. On a real instrument this is controlled by adjusting the vertical distance
between the pickups and the strings. In Strum this is adjusted using the Trim knob which allows
one to vary the amplitude of the neck pickup from -10 dB (leftmost position) to 10 dB (rightmost
position).
… 61 …


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