Roland VG-88 Manuel du propriétaire télécharger pdf (Page 8)

Concepts Behind Development of the V-Guitar System

■ The Process That Led to the

Birth of the V-Guitar System

The acoustic piano has enjoyed a history of hundreds of

years, culminating in the shape that it has today. The piano

craftsmen of the past must have longed for piano wires that

could be stretched just as tightly as they pleased.

Unfortunately, though, the wooden frames of those times

imposed practical limits on wire tension. Their dream finally

became reality with the advent of frames made of cast iron.

Piano craftsmen were no doubt delighted with this new

ability to build pianos just as they wanted.

Guitars have had a similar history. Through a continuing

process of trial, error, and improvement made in a variety of

ways, including the structure and materials for the wood,

strings, and paint, guitars have reached the shape they have

today. Now we have electric guitars equipped with pickups

and amplifiers that can produce sound at high volumes.

Does this mean that guitars have reached a state of

perfection?

Not necessarily. Throughout the ages, instruments have

constantly evolved through the effective use of new materials

as they became available. And as the twenty-first century

approaches, Roland has incorporated new materials —

silicon DSP chips — into guitars to create a new instrument

— the V-Guitar System.

■ Sound Modeling

Roland believes that the final evaluation of an electric

guitar’s sound should not be based only on sound output

from the guitar itself, but should also include the sound that

passes through the guitar amps, speakers, and other

equipment.

To achieve this, it’s necessary to simulate all the steps along

the way — from the moment a guitar string is plucked, until

the time the sound reaches the ears — thereby re-creating the

sound. Roland has made it possible to re-create these steps

with this latest sound modeling technology — in other

words, other means are used to make a virtual model of the

physical structures and materials that actually exist.

■ Composite Object Sound

Modeling: COSM

The new Composite Object Sound Modeling (COSM)

advanced by Roland combines a number of sound modeling

technologies to create even newer sounds. COSM creates

new string vibrations while retaining all the expressiveness,

response, and tension that are inherent in the sounds of a

guitar.

Roland believes that the ability to produce sounds based on

entirely new concepts while making full use of conventional

methods of play, and the fact that these sounds have full

musical value, are of the greatest importance for a guitar

player.

COSM GUITAR/COSM AMP

COSM guitar/COSM amp are modeling technologies that

can reproduce the sounds of any existing guitar. This

includes the following.

• Electronic Modeling, which simulates all characteristics

which can be attributed to the use of vacuum tubes,

transistors, and all other electronic circuitry.

• Magnetic Modeling, which simulates all the characteristics

which can be produced as a result of using pickups,

transformers, speakers, and other electromagnetic parts.

• Physical Modeling, which simulates all the characteristics

that are produced as a result of the use of certain types of

materials to make a guitar, including the kind of wood,

metal parts, or finish that are used.

In addition, COSM guitar is able to produce completely new

sounds that never existed before. The numerous harmonics

contained in the sound from the vibrating strings (the sound

source) can be radically emphasized, added to, or removed,

in order to create totally new guitar sounds.

A guitarist conveys musical expression through string

vibration. Vibrating strings carry a great deal of information

about the dynamics of a performance, including that which

expresses the way in which strings have been pressed, the

location at which they’ve been picked, the position of the

pick, and the kind of vibrato that’s been used. The V-Guitar

system uses the string vibration itself (which contains all of

this performance information) as the sound source, and can

create not only previously existing guitar sounds, but also

completely new sounds. One great advantage of this system

is that it preserves the playing dynamics of the guitarist, as

they are conveyed by the vibration of the string.

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Roland VG-88 Manuel du propriétaire Page 8

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