Filter
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VOICE MODE
115
FILTER
The Filter parameters function lets you perform operations
which determine the characteristics of the tone.
The filter can be used to greatly modify the sound. Filter
parameters let you determine the cutoff frequency (i.e., the
frequency at which the filter begins to affect the sound), cutoff
scaling and settings for the filter envelope generator (FEG). The
filter removes a specified range of frequencies from the sound
and allows the rest to pass through, thus giving you powerful
control over a sound s characteristics. For example, if the high
frequencies are removed and the low frequencies are allowed to
pass through, the result will be a darker sound, since the lower
range is emphasized and the upper range is de-emphasized.
This type of filter is called a Low Pass Filter, or LPF. The various
types of filters include the following:
LPF (Low Pass Filter) - The LPF produces a filter
response that allows only frequencies below the cutoff
frequency to pass. The LPF filter type has a steep 24-dB/
octave cutoff slope.
Cutoff
Frequency
PASSBAND
(Signals in this
frequency range
pass through)
Signals above the
cutoff frequency
are blocked
LEVEL
FREQUENCY
HPF (High Pass Filter) - The HPF produces a filter
response that allows only frequencies above the cutoff
frequency to pass.
Cutoff
Frequency
PASSBAND
(Signals in this
frequency range
pass through)
Signals above the
cutoff frequency
are blocked
LEVEL
FREQUENCY
BPF (Band Pass Filter) - The BPF produces a filter
response that allows only a band of frequencies centered
at the cutoff frequency to pass. The band parameter
determines the width of the pass band.
FREQUENCYCutoff (center)
Frequency
PASSBAND
LEVEL
BEF (Band Elimination Filter) - The BEF produces a
filter response that eliminates a band of frequencies
centered at the cutoff frequency to pass. The band
parameter determines the width of the elimination band.
FREQUENCYCutoff (center)
Frequency
LEVEL
PASSBAND PASSBAND
NOTCH
(Rejection Band)
THRU (Through) - The THRU setting allows all
frequencies to pass
through
, i.e., no filter is applied.
FREQUENCYCutoff
Frequency
All signals
pass through
LEVEL
You can also control the filter by key velocity sensitivity by
EG or low frequency oscillator (LFO). The velocity changes
affect the attack portion. Applying LFO to the filter creates filter
modulation, or wah-wah. A specified controller (such as
modulation wheel or foot controller) can be used to adjust the
depth of the filter modulation caused by the LFO. Depending
on the filter selected, EG or LFO is displayed in the screen.