Roland XP-30 owner manual Modulating Sounds LFO, LFO1/LFO2

Chapter 3. Creating Your Own Sounds

■Modulating Sounds (LFO)

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.

How to Use the LFO

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.

LFO1/LFO2

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

Form (LFO Form)

Select the waveform of the LFO.

TRI SIN SAW SQR

triangle wave	sine wave	sawtooth wave	square wave
TRP	S&H	RND	CHS

trapezoidal wave	sample &	random wave chaos wave
	hold wave

Key Sync (LFO Key Sync)

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

Rate (LFO Rate)

Adjust the modulation rate of the LFO.

*If you have set the External Sync value to CLOCK, this parameter will indicate a note value in multiples of a quarter note, and the corresponding note value symbol will also be displayed. This allows you to set the LFO rate in terms of a note length in the synchronization tempo.

*The Chaos waveform has no wavelength. When the Chaos waveform is selected, the Rate setting has no effect.

ExtSync (LFO External Sync)

Select how the LFO will be synchronized.

OFF: Unsynchronized

CLOCK: 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.

Mode (LFO Fade Mode)

Select how the LFO will be applied.

ON-IN:The LFO will fade in after the key is pressed.

high (more)	Delay	Fade
	Time	Time
		Depth
WG Pitch /
TVF Cutoff Frequency /
TVA Level / TVA Pan	key is
low (less)	pressed

ON-OUT:The LFO will be immediately applied when the

key is pressed, and will then fade out.

high (more)	Delay Time	Fade Time
WG Pitch /		Depth
TVF Cutoff Frequency /
TVA Level / TVA Pan	key is
low (less)	pressed

OFF-IN:The LFO will fade in after the key is released.

high (more)		Delay	Fade
		Time	Time
WG Pitch /			Depth
TVF Cutoff Frequency /
TVA Level / TVA Pan	key is	key is
low (less)	pressed	released

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