CHAPTER 23. LIVE INSTRUMENT REFERENCE
392
23.8.3
LFO Section
Operator's LFO
Parameters.
The LFO in Operator can practically be thought of as a fth oscillator. It runs at audio
rates, and it modulates the frequency of the other oscillators. It is possible to switch LFO
modulation on or off for each individual oscillator (and the lter) using the Dest. A buttons
in the LFO's display. The intensity of the LFO's modulation of these targets can be adjusted
by the Dest. A slider. The LFO can also be turned off entirely if it is unused.
The Dest. B chooser allows the LFO to modulate an additional parameter. The intensity of
this modulation is determined by the Dest. B slider.
The LFO offers a choice of classic LFO waveforms, sample and hold (S&H), and noise.
Sample and hold uses random numbers chosen at the rate of the LFO, creating the random
steps useful for typical retro-futuristic sci- sounds. The noise waveform is simply bandpass-
ltered noise.
Tip:
FM synthesis can be used to create fantastic percussion sounds, and using the LFO
with the noise waveform is the key to great hi-hats and snares.
The frequency of the LFO is determined by the LFO Rate control in the shell, as well as
the low/high/sync setting of the adjacent LFO Range chooser. The frequency of the LFO
can follow note pitch, be xed or be set to something in between. This is de ned by the
Rate<Key parameter in the LFO's display. With the R (Retrigger) button enabled, the LFO
restarts at the same position in its phase each time a note is triggered. With R disabled, the
LFO is free-running.
The overall intensity of the LFO is set by the LFO Amount control in the shell. This parameter
scales both the Dest. A and B amounts and can be modulated by note velocity via the
