Roland MPU-401 Manuel d'utilisateur télécharger pdf (Page 7)

Wave Table AudioPlus 3200 Wave

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5. General MIDI Overview

The General MIDI or GM system is a set of standard shared tone generator

specifications specially designed for MIDI usage that was jointly formulated by

the Japan MIDI Standard Committee and the U.S. MMA for the purpose of

allowing performance data with a high level of compatibility to be created using

any type of tone generator.

The basic specifications of GM Tone Generators as specified by the GM System

are as follows: the number of voices (performances), sound mapping (sound set),

and mapping of rhythm sounds on the keyboard (percussion maps).

The Tone Generator Manufacturer has the liberty to determine what kind of sound

will be produced with respect to the sound name of a particular tone generator.

The different kinds of built-in effects and effect configurations differ from one tone

generator to the other. In this way, performances will sound differently to a

certain extent on different tone generators.

For the Tone Generator manufacturers to maintain sufficient compatibility with the

GM sound generators, the sounds and specifications must be determined to some

degree. It should also be noted that programmers play a vital role in this matter. The

programmers must cooperate in the quest for high grade compatibility, examining

different kinds of GM Tone Generators and giving in if necessary during the creation

of their sequences. For anybody who programs their own MIDI sequence data that are

to be issued out as GM system data, maintaining sufficient amount of compatibility

with the existing GM sound generators should be taken into consideration.

For cases when the MIDI data was produced for copyrighted pieces, the data

cannot be distributed without proper authorization from the person owning the

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Roland MPU-401 Manuel d'utilisateur Page 7