Manual AAS Strum Acoustic GS-1 (page 23 of 91) (English)

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Keyboard Layout 23

3 Keyboard Layout

Strum reacts to MIDI signal differently than a traditional synthesizer. It uses a special keyboard

layout and associates signals from standard MIDI controllers with speciﬁc effects or techniques on

the guitar. In this chapter, we will describe how the keyboard is used to play Strum.

The MIDI signal received by Strum is interpreted in terms of the fretting hand (usually left

hand) and picking hand (usually right hand) of a guitar player. The range of the MIDI keyboard

has therefore been divided into two sections, the Lead & Chord keys section and the Strumming

Keys section as illustrated in Figure 10.

3.1 Lead and Chord Keys

This section is associated with the fretting hand of the guitarist and includes notes ranging from

MIDI note numbers 40 (E1) to 70 (B4). This section of the keyboard is where melodies and

chords are played and it is the MIDI signal from this section which is sent to the chord detection

and voicing modules. Strum will try to detect a chord and ﬁnd a corresponding voicing as soon as

three keys or more are depressed on the keyboard, otherwise it will play the notes as a melody or

an interval.

3.2 Strumming Keys

Notes with MIDI number ranging between 71 (B4) and 84 (C6) are interpreted as special strum-

ming keys and are used to trigger different picking hand techniques as shown in Figure 10. De-

pending on the strumming keys used one can trigger downstrokes, upstrokes as well as palm muted

or mufﬂed downstrokes and upstrokes. Strings can also be triggered individually to play arpeggio

patterns. The effect of the different strumming keys is now reviewed.

3.2.1 Downstroke and Upstroke

A downstroke is achieved by dragging a pick (or the ﬁngers) across the strings of the guitar in a

downward motion. Notes are therefore played from lowest to highest. An upstroke is obtained in

the same manner but dragging the pick or ﬁngers upwards from the highest to the lowest string.

A downstroke is triggered by depressing MIDI note 72(C5) while an upstroke is triggered by de-

pressing MIDI note 74 (D5). These strokes represent the simplest way to play chords on a guitar

and can be played alternately. Note that when strings are not used in a speciﬁc voicing (strings

marked with an X in the chord display of the graphical interface), they are not played when using

a downstroke or an upstroke.

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AAS Strum Acoustic GS-1 Manual

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