Filter
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MOTIF Basic Structure
Main functions
Basic Structure
• Band Pass Filter
This only passes a band of signals around the Cutoff
frequency. The width of this band can be varied.
• Band Elimination Filter
This attenuates a band of signals around the Cutoff
frequency, but passes everything else.
● FEG (Filter Envelope Generator)
Using the FEG, you can control the transition in
tone from the moment a note is pressed on the
keyboard to the point at which it is released. As
illustrated at right, the Filter Envelope consists of
five Time (transition speed) parameters and five
Level parameters (for the amount of filtering).
When you press a note on the keyboard, the cutoff
frequency will change according to these envelope
settings. This is useful for creating automatic wah
effects, for example. Furthermore, different FEG
parameters can be set for each Element.
■ Amplitude
Reference (page 145)
This unit controls the output level (amplitude) of each
Element output from Filter. The signals are then sent
at this level to the Effect block. Also, by setting the
AEG (Amplitude Envelope Generator), you can
control how the volume changes over time.
● AEG (Amplitude Envelope Generator)
Using the AEG, you can control the transition in
volume from the moment a note is pressed on the
keyboard to the point at which it is released. As
illustrated at right, the Amplitude Envelope consists
of five Time (transition speed) parameters and five
Level parameters (for the amount of filtering).
When you press a note on the keyboard, the volume
will change according to these envelope settings.
Furthermore, different AEG parameters can be set
for each Element.
■ LFO (Low Frequency Oscillator)
Reference (page 147)
As its name suggests, the LFO creates waveforms of a
low frequency.
These waveforms can be used to vary the pitch, filter or
amplitude of each Element to create effects such as
vibrato, wah and tremolo. LFO can be set
independently for each Element; it can also be set
globally for all Elements.
Range passed
Frequency
Level
Cutoff range Cutoff range
Center frequency
Cutoff range
Frequency
Level
Range passed Range passed
Center frequency
0
Release
Level
Attack
Level
Hold Level
Attack
Time
Hold
Time
Decay1
Time
Decay2
Time
Release
Time
Decay1
Level
Sustain
Level
Key off
Time
Level
0
Release
Level
Attack
Level
Init
Level
Attack
Time
Decay1
Time
Decay2
Time
Release
Time
Decay1
Level
Sustain
Level
Key off
Time
Level