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AAS Strum Acoustic GS-1 Manual

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20 An Overview of Strum Acoustic
2.2 Strumming
On a guitar, notes and chords are triggered by the action of the picking hand (usually right hand).
The resulting sound is very typical of a guitar as the guitarist triggers the strings sequentially, more
or less rapidly, with an up and down motion of the hand. Strings can also be played individually,
in different order, to create arpeggio patterns. Different sonorities can be obtained by damping
or muting the strings either by applying the picking hand on the strings near the bridge (palm
muting) or releasing the pressure on the notes played with the fretting hand (scratching) while
strumming. Using these different types of hand motions and techniques, the guitarist can create
complex melodic and rhythmic patterns. In Strum, these different effects can be achieved through
a strumming module which is controlled by special strumming keys or MIDI loops as will be
explained in more details in Chapter 3, 4 and 6.
2.3 The Graphical Interface
The graphical interface of the instrument is divided in three sections. From top to bottom on the
interface one first finds the output effect section which is used to shape the final sound of the
instrument. This effect section includes and equalizer a multi-effect module with sync capabilities
and a reverb.
The middle guitar-shaped section of the interface is where all the parameters controlling the
synthesis engine are located. The different control parameters refer to the strings, the pick and its
interaction with the strings, the action of fingers on the fretboard and the body of the guitar. This
section has seven different views. The main and simplest one (All)is used to display parameters
acting on the six strings of the guitar while the other six views reveal parameters for the individual
strings.
The bottom part of the interface is centered around a fretboard where the chords detected and
the specific voicings chosen by Strum are displayed. This section of the interface also includes
parameters determining how the voicing and strumming is performed by Strum, a MIDI loop player,
tuning parameters and controls determining how signals from some standard MIDI controllers are
interpreted by Strum.
2.4 Signal Flow
The general signal flow of Strum is presented in Figure 9 and illustrates schematically how the dif-
ferent modules in Strum interact. From left to right, the synthesizer first includes a chord detection
module which parses the MIDI signal it receives and determines the chords played on the keyboard.
This information is then sent to the voicing engine which, taking into account how a guitarist would
actually play the different chords, determines which notes are played on the different strings of the
guitar. The corresponding information, for each of the six strings of the instrument, is then sent to
a triggering or strumming module which generates an excitation signal for each of the individual
… 20 …


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