GEM GPS3600 Owner's Manual page 68

The modifications are expressed as relative val-
ues, subtracting them from or adding them to the
normal decay of the Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
RELEASE: This parameter is used to adjust the
amount of time a sound continues to play after
the key has been released. This "release time"
increases as the parameter value decreases
(negative). Maximum release times can last for
more than twenty thirty seconds after a key has
been released.
The modifications are expressed as relative val-
ues, subtracting them from or adding them to the
normal release of the Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
FILTER CUTOFF: In it's simplest form, this is
the sound's most important tone control. Cut-Off
is one half of the main filter controls, (the other
being "Resonance"). Usually these two are used
in combination for powerful manipulation of a
sound's tonal character. As the parameter value
is decreased (negative) the filter "closes" allow-
ing less of the original sound to pass through.
This generally has the effect of making the sound
warmer and less "fizzy". Increasing the param-
eter value (positive) "opens" the filter, increasing
the brilliance of the sound. The action of the filter
varies according to the type of filter contained in
the Sound.
Low-pass - Cuts into the higher frequen-
cies. As a result, if you use Sounds with a
low harmonic content, the notes at the higher
end will be cut. This parameter regulates the
"brilliance" of the Sound. Lowering the cutoff
frequency produces a mellow sound while an
increase produces a bright sound.
High-pass - Cuts into the lower frequencies,
making the sound brighter. The higher the
value, the "lighter" the sound.
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2•6 Reference Guide
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Band-pass - Allows the entire band to pass.
Modifies the phase of the Sound and is use-
ful when two oscillators that read the same
Wave are used.
Parametric boost - Enhances the frequen-
cies around the cutoff frequency, rendering a
sound brighter and stronger at the higher end.
Parametric cut - Attenuates the frequencies
around the cutoff frequency. Higher values
renders the sound weaker at the high end.
Assignable values: -63 (maximum decrease of
the cutoff frequency) ... 0 (unchanged) ... +63
(maximum increase of the cutoff frequency).
RESONANCE: This parameter, the second es-
sential element of filter control, introduces com-
plex harmonic overtones which are added to the
final sound. Sometimes these overtones can only
be produced when the Filter Cut-Off setting is low
enough. Try setting the Resonance parameter
fairly high and then modifying the Cut-Off param-
eter while you play. The distinctive sound of a
resonating filter is one of the key elements in
many classic synthesizer sounds.
Assignable values: -63 (least intensity) ... 0 (un-
changed) ... +63 (highest intensity).
Note: The higher values of resonance causes the
filter to enter into "auto-oscillation". If used wisely,
the auto-oscillation can create very suggestive syn-
thetic sounds, but can also increase the output level
excessively, causing disturbing distortion .
LFO RATE: This parameter can be used to ad-
just the speed of the "vibrato" or modulation in a
sound. It is designed to be used in conjunction
with the LFO DEPTH parameter
Assignable values: -63 (minimum rate) ... 0 (un-
changed) ... +63 (maximum rate).
LFO DEPTH: This parameter is used to set the
amount of "vibrato" or modulation applied to a
sound. If the current sound includes some type
of modulation or vibrato, you can use this param-
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