Modulating sounds (lfo1/2/step lfo) – Roland Sonar V-Studio VS-700 User Manual

Page 117

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Creating a Patch

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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.

Patch LFO 1/2

Waveform (LFO1/LFO2 Waveform)

Selects the waveform of the LFO.

Value

SIN:

Sine wave

TRI:

Triangle wave

SAW-U:

Sawtooth wave

SAW-D:

Sawtooth wave (negative polarity)

SQR:

Square wave

RND:

Random wave

BND-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.

BND-D:

Once the decay of the waveform output by the

LFO is allowed to develop in standard fashion,

the waveform then continues without further

change.

TRP:

Trapezoidal wave

S&H:

Sample & Hold wave (one time per cycle, LFO

value is changed)

CHAOS:

Chaos wave

VSIN:

Modified sine wave. The amplitude of the sine

wave is randomly varied once each cycle of the

waveform.

STEP:

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.

LFO Rate (LFO1/LFO2 Rate)

★

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

Value:

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.”

Rate Detune (LFO1/LFO2 Rate Detune)

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.”

Value:

0–127

Offset (LFO1/LFO2 Offset)

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.

Value:

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

Modulating Sounds (LFO1/2/Step LFO)

Setting

LFO Rate

(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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