Roland Fantom-Xa 用户手册
52
Creating a Patch
An LFO (Low Frequency Oscillator) causes change over a cycle in a sound. Each tone has two LFOs (LFO1/LFO2), and these can be used to
cyclically change the pitch, cutoff frequency and volume to create modulation-type effects such as vibrato, wah and tremolo. Both LFOs have the
same parameters so only one explanation is needed.
cyclically change the pitch, cutoff frequency and volume to create modulation-type effects such as vibrato, wah and tremolo. Both LFOs have the
same parameters so only one explanation is needed.
[F1 (LFO 1)], [F2 (LFO 2)]
Parameter marked with a “
★
” can be controlled using specified MIDI messages
fig.T-KF.e
Parameter Group [F6 (LFO&OUT)]
Modulating Sounds/Output
Modulating Sounds/Output
Parameter
Value
Explanation
Wave Form
SIN,
TRI,
SAWU,
SAWD,
SQR,
RND,
BD-U,
BD-D,
TRP,
S&H,
CHS,
VSIN,
STEP
TRI,
SAWU,
SAWD,
SQR,
RND,
BD-U,
BD-D,
TRP,
S&H,
CHS,
VSIN,
STEP
Waveform of the LFO
SIN:
Sine wave
TRI:
Triangle wave
SAWU:
Sawtooth wave
SAWD:
Sawtooth wave (negative polarity)
SQR:
Square wave
RND:
Random wave
BD-U:
Once the attack of the waveform output by the LFO is allowed to develop in standard fashion, the
waveform then continues without further change.
BD-D:
Once the decay of the waveform output by the LFO is allowed to develop in standard fashion, the wave-
form then continues without further change.
TRP:
Trapezoidal wave
S&H:
Sample & Hold wave (one time per cycle, LFO value is changed)
CHS:
Chaos wave
VSIN:
Modified sine wave. The amplitude of a sine wave is randomly varied once each cycle.
STEP:
A waveform generated by the data specified by LFO Step 1–16. This produces stepped change with a
fixed pattern similar to a step modulator.
* If you set this to “BD-U” or “BD-D,” you must turn the Key Trigger parameter to “ON.” If this is “OFF,” it will have
no effect.
Rate
★
0–127,
Note
Note
Modulation speed of the LFO
LFO Rate sets the beat length for the synchronized tempo is synchronized with the tempo set in a sequencer.
* This setting will be ignored if the Waveform parameter is set to “CHAOS.”
Rate Detune
0–127
Makes subtle changes in the LFO cycle rate (Rate parameter) each time a key is pressed.
Higher settings will cause greater change. This parameter is invalid when Rate is set to “note.”
Offset
-100–
+100
+100
Raises or lowers the LFO waveform relative to the central value (pitch or cutoff frequency).
Positive (+) settings will move the waveform so that modulation will occur from the central value upward.
Negative (-) settings will move the waveform so that modulation will occur from the central value downward.
Negative (-) settings will move the waveform so that modulation will occur from the central value downward.
Delay Time
0–127
Time elapsed before the LFO effect is applied (the effect continues) after the key is pressed (or released)
When using violin, wind, or certain other instrument sounds in a performance, rather than having vibrato
added immediately after the sounds are played, it can be effective to add the vibrato after the note is drawn
out somewhat.
added immediately after the sounds are played, it can be effective to add the vibrato after the note is drawn
out somewhat.
Delay Time KF
(Time Keyfol-
low)
(Time Keyfol-
low)
-100–
+100
+100
Adjusts the value for the Delay Time parameter depending on the key position, relative to the C4 key (center C).
To decrease the time with each higher key that is pressed in the upper registers, select a positive value; to in-
crease the elapsed time, select a negative value. Larger settings will produce greater change. If you do not want
the elapsed time to change according to the key pressed, set this to “0.”
crease the elapsed time, select a negative value. Larger settings will produce greater change. If you do not want
the elapsed time to change according to the key pressed, set this to “0.”
C4
C3
C2
C1
C5
C6
C7
0
+50
+100
-50
-100
Key
Time
Time Keyfollow
Fantom-Xa_e.book 52 ページ ２００４年１０月２２日 金曜日 午後２時３分