Edit Preset Sound - GEM GPS3600 Owner's Manual

4. Modify the parameters according to your
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requirements.
5. Press EDIT or ESCAPE to exit the editor.
6. If you want to store the Preset containing
the modified Sound/S.Patch parameters for
future use, save the modifications by press-
ing STORE PRESET then ENTER.
If you don't want to save the Preset, simply
select a different one and all your modifica-
tions will be lost.
OSCILLATORS AND LAYERS
It is useful to know something about the struc-
ture of the PS/GPS Rom Sounds and how they
are affected by the modifications you make un-
der the Edit Sound/S. Patch editor.
The PS/GPS Sounds can comprise 1, 2 or 3 lay-
ers. The layers are sound generating units con-
sisting of 1 or 2 oscillators. Each oscillator elabo-
rates a Wave sample, or waveform. Conse-
quently, each polyphonic voice can be generated
by 6 simultaneous oscillators.
The structure of the Sounds is represented in the
diagram below. The «Edit Preset Sound» tasks
modify all layers and all oscillators simultaneously.
This allows all the parameters of a Preset Sound
to be edited by means of a few, simple opera-
tions.
Sound structure. The number of layers and oscillators can
change from a Sound to another.
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EDIT PRESET SOUND

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In «Edit Preset Sound», you can program a set
of principal preset parameters that will affect any
sound you decide to assign to a track of the cur-
rent Preset.
THE PRESET SOUND PARAMETERS
ATTACK: This parameter adjusts the time taken
for a sound to reach it's maximum volume level
after a key has been pressed. Setting a very fast
attack time will make a sound more percussive.
Setting a slower attack time will cause the sound
to fade in slowly when a key is pressed.
The modifications are expressed as relative val-
ues, subtracting them from or adding them to the
normal attack of the Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
DECAY: This parameter will only affect those
sounds which feature "decay". Decay is the ef-
fect of something fading away as you hold a key
on the keyboard. A piano sound is a good exam-
ple of a sound which has decay. As you hold
down the key, the sounds fades away or "decays".
Eventually you will hear no sound at all. An or-
gan sound, on the other hand, has no decay. The
level of the sound remains the same as long as
you hold down a key. The decay parameter is
used to adjust the amount of time it takes a sound
to decay, (in the case of our piano sound that
would be the amount of time it took between when
the sound is at maximum level and the point at
which we no longer hear anything).
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Sounds 2•5
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