Bedienungsanleitung AAS Strum Acoustic GS-1 (Seite 19 von 91) (Englisch)

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An Overview of Strum Acoustic 19

2 An Overview of Strum Acoustic

Strum Acoustic is a synthesizer which was designed with the goal of enabling keyboard players to

easily create realistic guitar tracks. This is a task which is usually difﬁcult to achieve due to the

very different nature of these two types of instruments. Strum was therefore designed to reproduce

not only the sounding mechanism of a guitar but also the main elements of the playing technique

of a guitar player.

Very generally playing on a guitar can be described in terms of fretting hand (usually left hand)

and picking hand (usually right hand) techniques. The fretting hand is used to ﬁx the chords or

notes played on the different strings of the guitar while the picking hand is used to set the different

strings into vibration and therefore play melodies or strumming patterns. In Strum, these functions

have been integrated into a chord detection, voicing, and strumming module.

2.1 Chord Detection and Voicing

Chords played on a keyboard and a guitar share the same name but are played or voiced differently.

Because of the tuning of the strings on a guitar, the notes of the chord are not usually played

in the same order as on a keyboard and the range of the notes is usually different, notes may

also be repeated. Furthermore, the same chords can be played in different positions on the guitar

depending on the playing or musical style. This speciﬁc way of playing chords on a guitar is very

characteristic of the tone and sound of the instrument. It is therefore very important, in order to

obtain a realistic guitar sound, to play chords as a guitar player would rather than how they are

played on the keyboard.

The voicing of chords for the guitar is performed in two steps by Strum. A chord played on the

keyboard is ﬁrst interpreted by the chord detection module in order to determine which chord was

played on the keyboard. Strum then ﬁnds a guitar voicing corresponding to this chord. In other

words, Strum ﬁnds how a guitar player would have played this particular chord.

When chords are played on the keyboard, the order of the notes above the root is not taken

into account by the chord detection engine. This implies that you can play the chords as you know

them on the keyboard without having to know or learn special voicings used by guitar players. For

example, you could play chords in close position with the left or right hand, you could also play

the root with the left hand and the rest of the chord with the right hand or play the chords with

the notes spread across both hands. Strum will take care of ﬁnding the right voicing and playing

position on the guitar depending on the settings of the chord type and playing position controls as

described in section 4.6

The name of the chord detected as well as the speciﬁc voicing chosen by Strum is displayed in

the fretboard located in the lower portion of the graphical interface. Note that the voicing chosen by

Strum varies depending on the chord type chosen by the user as is described in Section 4.6. Strum

will try to detect a chord as soon as three or more keys are depressed on the keyboard. Otherwise

Strum will assume that a melody or interval is played. Please refer to section 11 for a list of the

chords detected by Strum.

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