General Music WK4, Owner'S Manual, Page: 253 / 376

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Edit Perf Sound 19•3
THE PERF SOUND PARAMETERS
Attack
Represents the attack phase of the sound. This
parameter modifies the time taken (rate) for the
sound to pass from the silent state to maximum
volume when a note is pressed. The modifica-
tions are expressed in relative values, subtract-
ing or adding them to the normal attack of the
Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
Decay
Represents the decay phase of the Sound. This
parameter modifies the time taken (rate) for the
sound to pass from its maximum volume level to
silence after the attack phase. The modifications
are expressed in relative values, subtracting or
adding them to the normal decay of the Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
Release
Represents the release phase of the Sound. This
parameter modifies the time taken (rate) for the
sound to pass to total silence after note release.
The modifications are expressed in relative val-
ues, subtracting or adding them to the normal
release of the Sound.
Assignable values: -63 (maximum rate) ... 0 (un-
changed) ... +63 (minimum rate).
Filter Cutoff
Modifies the cutoff frequency. Changes the fre-
quency at which the filter intervenes on the sound.
The action of the filter varies according to the fil-
ter:
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.
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
Resonance creates a peak of emphasis at the
cutoff frequency to the point of sending it in “auto-
oscillation”. The higher values of resonance pro-
duced effects that were common in the analog
synths.
Assignable values: -63 (least intensity) ... 0 (un-
changed) ... +63 (highest intensity).
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Note: The higher values of resonance causes
the filter to enter into “auto-oscillation”. If used
wisely, the auto-oscillation can create very
suggestive synthetic sounds, but can also increase
the output level excessively causing disturbing
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distortion.