Roland Fantom-Xa 业主指南
45
Creating a Patch
A filter cuts or boosts a specific frequency region to change a sound’s brightness, thickness, or other qualities.
[F1 (TVF PRM)]
Parameter marked with a “
★
” can be controlled using specified MIDI messages
Parameter Group [F3 (TVF)]
Modifying the Brightness of a Sound with a Filter (TVF/TVF Envelope)
Modifying the Brightness of a Sound with a Filter (TVF/TVF Envelope)
Parameter
Value
Explanation
Filter Type
OFF,
LPF,
BPF,
HPF,
PKG,
LPF2,
LPF3
LPF,
BPF,
HPF,
PKG,
LPF2,
LPF3
Type of filter
OFF:
No filter is used.
LPF:
Low Pass Filter. This reduces the volume of all frequencies above the cutoff frequency in order to
round off, or un-brighten the sound.
BPF:
Band Pass Filter. This leaves only the frequencies in the region of the cutoff frequency, and cuts the
rest. This can be useful when creating distinctive sounds.
HPF:
High Pass Filter. This cuts the frequencies in the region below the cutoff frequency. This is suitable
for creating percussive sounds emphasizing their higher tones.
PKG:
Peaking Filter. This emphasizes the frequencies in the region of the cutoff frequency. You can use
this to create wah-wah effects by employing an LFO to change the cutoff frequency cyclically.
LPF2:
Low Pass Filter 2. Although frequency components above the Cutoff frequency are cut, the sensi-
tivity of this filter is half that of the LPF. This filter is good for use with simulated instrument sounds
such as the acoustic piano.
such as the acoustic piano.
LPF3:
Low Pass Filter 3. Although frequency components above the Cutoff frequency are cut, the sensi-
tivity of this filter changes according to the Cutoff frequency. While this filter is also good for use with
simulated acoustic instrument sounds, the nuance it exhibits differs from that of the LPF2, even with the
same TVF Envelope settings.
simulated acoustic instrument sounds, the nuance it exhibits differs from that of the LPF2, even with the
same TVF Envelope settings.
* If you set “LPF2” or “LPF3,” the setting for the Resonance parameter will be ignored.
Cutoff Frequency
★
0–127
Frequency at which the filter begins to have an effect on the waveform’s frequency components
Resonance
★
0–127
Emphasizes the portion of the sound in the region of the cutoff frequency, adding character to the sound.
* Excessively high settings can produce oscillation, causing the sound to distort.
Cutoff Keyfollow
-200–
+200
+200
Use this parameter if you want the cutoff frequency to change according to the key that is pressed.
Relative to the cutoff frequency at the C4 key (center C), positive (+) settings will cause the cutoff fre-
quency to rise for notes higher than C4, and negative (-) settings will cause the cutoff frequency to fall
for notes higher than C4. Larger settings will produce greater change.
quency to rise for notes higher than C4, and negative (-) settings will cause the cutoff frequency to fall
for notes higher than C4. Larger settings will produce greater change.
LPF
BPF
Resonance
HPF
PKG
parameter value
Level
Cutoff frequency
Frequency
High
Low
C4
C3
C2
C1
C5
C6
C7
0
+50
+100
+200
-50
-100
-200
o
-1
-2
+1
+2
Cutoff frequency
(Octave)
(Octave)
Cutoff Keyfollow
Key
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