Roland VS-700 用户手册

 

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.

 

Selects the waveform of the LFO.

 

Sine wave

 

Triangle wave

 

Sawtooth wave

 

Sawtooth wave (negative polarity)

 

Square wave

 

Random wave

 

Once the attack of the waveform output by the 

LFO is allowed to develop in standard fashion, 

the waveform then continues without further 

change.

 

Once the decay of the waveform output by the 

LFO is allowed to develop in standard fashion, 

the waveform then continues without further 

change.

 

Trapezoidal wave

 

Sample & Hold wave (one time per cycle, LFO 

value is changed)

 

Chaos wave

 

Modified sine wave. The amplitude of the sine 

wave is randomly varied once each cycle of the 

waveform.

 

A waveform generated by the data specified in 

LFO Step 1–16. This produces a fixed pattern of 

stepwise change, like that created by a step 

modulator.

 

If you set this to “BND-U” or “BND-D,” you must turn the 

Key Trigger parameter to “ON.” If this is “OFF,” it will 

have no effect.

 

★

 

Adjusts the modulation rate, or speed, of the LFO.

 

 0–127, 

Note

LFO Rate sets the beat length for the synchronized tempo is 

synchronized with the tempo set in an external MIDI 

sequencer.

(Example)

For a tempo of 120 (120 quarter notes occur in 1 minute (60 

seconds))

 

This setting will be ignored if the Waveform parameter 

is set to “CHAOS.”

 

LFO Rate Detune 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.”

 

 0–127

 

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.

 

 

-100, -50, 0, +50, +100

 

Modulating Sounds (LFO1/2/Step LFO)

 

 (half note)

1 second (60 / 60 = 1 (second))

 (quarter note)

0.5 seconds (60 / 120 = 0.5 (seconds))

 (eighth note)

0.25 seconds (60 / 240 = 0.25 (seconds))

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