APPLIED ACOUSTICS SYSTEMS Strum Acoustic GS-1, Руководство пользователя

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56 Parameters
Figure 25: Editing parameters for string number 6 (E2).
from 6 to 1 with 6 being the lowest string (E2) and 1 being the highest one (E4). Clicking on the
different string numbers reveals parameters for this specific string which implies that all strings can
be tuned independently.
It is important to know that parameters from the different parameter sections can be copied
from string to string or all of them at once by clicking on the down-pointing arrow located next
to the section name label and choosing one of the proposed destination. Remember also that a
specific parameter can be adjusted for all the strings simultaneously by ctrl-clicking (Windows) or
Command-clicking (Mac OS) on the corresponding knob and moving it.
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.
6.6.1 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 .