21
LFO Slew
Displayed as: Slew
Initial value: 0
Range of adjustment: 0 to 127
Slew has the effect of modifying the shape of the LFO waveform. Sharp edges become
less sharp as Slew is increased. The effect of this can be heard on pitch modulation by
selecting Square as the LFO waveform and setting the rate fairly low so that when a key
is pressed the output alternates between just two tones. Increasing the value of Slew
will cause the transition between the two tones to become a “glide” rather than a sharp
change. This is caused by the vertical edges of the square LFO waveform being slewed.
Note that Slew has an effect on all LFO waveforms, but the sonic effect
differs with waveform rate and type. As Slew is increased, the time taken
to reach maximum amplitude is increased, and can ultimately result in it
never being achieved at all, though the setting at which this point is
reached will vary with waveform.
SQUARE WAVE
NO SLEW
SMALL SLEW VALUE
LARGE SLEW VALUE
Fade Mode
Displayed as: FadeMode
Initial value: FadeIn
Range of adjustment: FadeIn, FadeOut, GateIn, GateOut
The function of the four possible settings of FadeMode are as follows:
1. FadeIn – the LFO’s modulation is gradually increased over the time period set
by the Fade Time control
16
.
2. FadeOut – the LFO’s modulation is gradually decreased over the time period
set by the Fade Time control, leaving the note unmodulated.
3. GateIn – the onset of the LFO’s modulation is delayed by the time period set
by the Fade Time parameter, and then starts immediately at full level.
4. GateOut – the note is fully modulated by the LFO for the time period set by
the Fade Time parameter. At this time, the modulation stops abruptly.
Note that whichever of the Fade Modes is selected, it is always active; if you do not want to
hear its effect, turn the Fade Time control
16
down to zero.
LFO Fade Sync
Displayed as: FadeSync
Initial value: On
Range of adjustment: Off or On
The setting of FadeSync only applies to monophonic voice modes (see
“Voices” on page 27). FadeSync determines whether the time delay set by Fade
Time is re-started each time a key is pressed. With FadeSync set to On (the default),
the LFO fade time recommences; when set to Off, it is triggered only by the first note. This
will only be of relevance when playing in legato style.
Repeats
Displayed as: Repeats
Initial value: Off
Range of adjustment: Off, 1 - 127
Repeats sets how many cycles of LFO waveform will be generated each time the LFO
is triggered. So if set to 1, you will only hear the effect of any LFO modulation for a single
cycle, and hence for a short duration (depending on the setting of Rate, of course).
LFO Common Sync
Displayed as: Common
Initial value: Off
Range of adjustment: Off or On
Common Sync is only applicable to polyphonic voices. When Common is On, it ensures
that the phase of the LFO waveform is synchronised for every note being played. When
set Off, there is no such synchronisation, and playing a second note while one is already
pressed will result in an unsynchronised sound as the modulations will be out of time.
When LFOs are in use for pitch modulation (their most common application), having
Common set to Off will give more natural results.
NOTE 1
KEY "ON"
NOTE 2
KEY "ON"
NOTE 1
KEY "ON"
NOTE 2
KEY "ON"
Set Common to On for an emulation of early analogue polyphonic synths.
The default menu display for LFO 3 is shown below:
LFO 3 7/8
L3Rate 0
L3Waveform Triangle H
L3RateSync Off
LFO 3/4 Waveform
Displayed as: LxWaveform (where x= 3 or 4)
Initial value: Triangle
Range of adjustment: Triangle, Sawtooth, Square, Rand S/H
This parameter sets the basic waveform for LFO 3 or LFO 4. The options available are the
same as those selected from the top panel Type control
15
for LFOs 1 and 2.
LFO 3/4 Rate
Displayed as: LxRate (where x= 3 or 4)
Initial value: 0
Range of adjustment: 0 to 127
The Rate parameter sets the LFO frequency; it has the same function as the top panel
Rate control [18] for LFOs 1 and 2, though with an expanded frequency range as the high/
low range selection is absent.
LFO 3/4 Rate Sync
Displayed as: LxRateSync (where x= 3 or 4)
Initial value: Off
Range of adjustment: Off, See table at page 37 for full details
LFO Rate Sync allows the speed of the LFO to be synchronised to an internal or external
MIDI clock: the parameter selects the sync division factor. LFO Rate Sync overrides the
Rate parameter, so if it is set to anything other than Off, adjusting Rate has no effect.
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