Roland XP-30 用户手册

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The LFO (Low Frequency Oscillator) creates cyclic change. 
Each Tone has two LFOs, and these can be used to apply 
change to the WG Pitch/TVF Cutoff Frequency/TVA Level/
TVA Pan.

Since both LFOs have the same parameters, there are 
explained here together.

Select the waveform of the LFO.

fig.3-36.e

Specifies whether you want the LFO cycle to start in sync 
with the timing of a key press (ON) or not (OFF).

Adjust the modulation rate of the LFO.

Select how the LFO will be synchronized.

Unsynchronized

Synchronize the LFO to the Patch Tempo, 
Performance Tempo, or the tempo clock of the XP-
30’s system.
If you want to use a fixed tempo in Patch mode 
(Tempo parameter setting), set the Source 
parameter (PATCH/COMMON/PATCH 
CLOCK) to PATCH and set the desired tempo. 
If you want to use the system’s tempo clock in 
Patch mode, set the Source parameter (PATCH/
COMMON/PATCH CLOCK) to SYSTEM.
If you want to use a fixed tempo in Performance 
mode (Tempo parameter setting), set the Source 
parameter (PERFORM/COMMON/PERFORM 
CLOCK) to PERFORM and set the desired tempo. 
If you want to use the system’s tempo clock in 
Performance mode, set the Source parameter 
(PERFORM/COMMON/PERFORM CLOCK) to 
SYSTEM.

Select how the LFO will be applied.

The LFO will fade in after the key is pressed.

fig.3-37.e

The LFO will be immediately applied when the 
key is pressed, and will then fade out.

fig.3-38.e

The LFO will fade in after the key is released.

fig.3-39.e

Applying LFO to the Pitch creates vibrato, applying it to 
TVF Cutoff Frequency creates wah, and applying it to TVA 
Level creates tremolo. When LFO is applied to the TVA 
Pan, the stereo location of the sound will change cyclically.
Depending on the settings, LFO can be used to cyclically 
exchange two Tones. For example if you wish to shift 
back and forth between Tones 1 and 2, select the same 
LFO settings for both, but make LFO Depth settings of 
opposite polarity (+/-) for their TVA Level settings.

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