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(5) General Use Areas and Special Use Areas
The lower half of the tone map (GS Bank Select numbers
0-63) is a general use area, and
the upper half (GS Bank
Select numbers
64-127) is a special use area.
The special use
area is for entering sounds that you concoct yourself, or for special tones on a particular
device.
A variety of special-effects sounds are also assigned to the general use area, in the
range of Program Change numbers from
121 to 128.
127
o ®
Alternate voicing
Special use area
8 Е
does't operate
8 x
63%
N
3 9
Ç
General-use area
Alternate voicing operate
128
Program change number
Since the contents of the special use area can be so different from one device to the next,
even among
GS sound sources, the Alternate Voicing rules we talked about don't apply
here.
That is, if the indicated tone location happens to be empty, no sound is played.
The GS Format also includes a place in the general use area for special effects sounds
(SFX).
From one spot to another in the tone map there is an incredible variety of sounds.
This means of course that, if we tried to use Alternate Voicing here, we might get a dog
barking where we asked for a cat meowing
- not at all similar sounds! And so Alternate
Voicing doesn't operate here either.
(6) Chorus and Reverb
Every part in a GS sound source can have chorus and reverb effects added to it, and the
depth of effects can be controlled
in real time using Control
Change
message*.
The
Control Change number used for this is standardized in the GS Format, so that no matter
what GS sound source you're using, the right kind of effect will turn on or off.
* Control Change
91 controls the depth of Reverb, and 93 controls the depth of Chorus.
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