Yamaha MOTIF RACK ES Owner's Manual page 56

Tone generator block Tone generator parameters that produce the Voice sound
Attack
Level
Pitch
Hold
Level
0
Hold Attack Decay 1
Time Time Time
Pressing the key (Note on)
Filter
[VOICE] select Voice [EDIT]
select Element/Key Filter display, FEG display
This unit modifies the tone of the sound output from Pitch by
cutting (or filtering) the output of a specific frequency portion of the
sound.
Cutoff Frequency and Resonance
In the example below (a low pass filter), a portion of the signal lower
than a given frequency is allowed to pass, and signals above that
frequency are cut. This frequency is referred to as the cutoff frequency.
You can produce a relatively bright or darker sound by setting the
cutoff appropriately. Resonance is a parameter that boosts the level of
the signal in the area of the cutoff frequency. By emphasizing the
overtones in this area, this can produce a distinctive "peaky" tone,
making the sound brighter and harder.
Level
These frequencies are
"passed" by the filter.
Level
Cutoff frequency
About the main Filter types
The Low Pass Filter is shown in the illustration above – however, this
synthesizer features other Filter types (four total) as shown below.
• Low Pass Filter (above)
This passes only those signals below the Cutoff frequency. You can
then use the Reso (Resonance) parameter to add further character to
the sound.
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Owner's Manual
Decay 1
Level
Sustain Level
(Decay 2 Level)
Release
Level
Decay 2 Release
Time Time
Releasing the key (Note off)
[MUTE/SEL/ENTER] (LED turns off)
Cutoff frequency
Frequency
(pitch)
Resonance
Frequency
(pitch)
• High Pass Filter
This passes only those signals above the Cutoff frequency. You can
then use the Reso (Resonance) parameter to add further character to
the sound.
Level
Time
• Band Pass Filter
This passes only those a band of signals around the Cutoff frequency.
The width of this band can be varied.
Level
Cutoff range
• Band Elimination Filter
This attenuates a band of signals around the Cutoff frequency, but
passes everything else.
Level
Range passed
FEG (Filter Envelope Generator)
Using the FEG, you can control the transition in tone from the moment
the sound starts to the moment it stops. You can create the FEG by
setting parameters as illustrated below. When the instrument receives
a Note On message, the cutoff frequency of the Voice will change
according to these envelope settings. This is useful for creating
automatic wah or filter sweep effects, for example. Furthermore,
different FEG parameters can be set for each Element or Key.
Cutoff
Frequency
Hold
Level
0
Hold
Attack
Time
Time
Pressing the key (Note on)
These frequencies are
"passed" by the filter.
Resonance
Center frequency
Range passed
Frequency
Center frequency
Cutoff range
Frequency
Center frequency
Attack
Level
Decay 1
Level
Sustain Level
(Decay 2 Level)
Decay 2
Decay 1
Time
Time
Releasing the key (Note off)
Release
Level
Time
Release
Time