LFOs
74
LFO Waveforms
Start Phase
[-180…+180]
This controls the phase of the waveform at the start of the note. If
Random Start Phase
is
On
, or if one of the Random
waveforms is selected, this parameter is not shown.
Rndm° (Random Start Phase)
[Off, On]
When
Random Start Phase
is
On
, the LFO will start at a different, random phase every time. If one of the Random
waveforms is selected, this parameter is not shown.
Offset
[–100…+100]
By default, almost all of the LFO waveforms are centered around 0, and then swing all the way from -100 to +100.
Offset
lets you shift the LFO up and down, so that—for instance—it’s centered on 50, and then swings from -50 to
+150.
For example, let’s say that you’re using an LFO for vibrato. If
Offset
is
0
, the vibrato will be centered on the note’s
original pitch, bending it both up and down.
If
Offset
is
+100
, on the other hand, the vibrato will only raise the pitch above the original note.
Offset settings and pitch change produced by vibrato
The one exception to this is the
Guitar
waveform, which is designed to emulate bending a string on a guitar–so that the
pitch only goes up, and not down. Because of this, the waveform is centered on 50, and not on 0. Of course, you can
always use a negative
Offset
to shift it back down below 0 again!
Offset
affects the signal
after
the
Shape
function, as shown below:
LFO Signal Flow
Curve
(CURVE)
[–100…+100]
Curve
adds curvature to the basic waveform. As you can see in the graphic below, this can make the waveforms either
more rounded or more extreme. It can also be useful to emphasize certain value ranges, and deemphasize others.
For example, let’s say that you are using a triangle LFO to modulate filter cutoff. If
Curve
emphasizes the high value
range, the filter will spend more time at the higher frequencies. If it emphasizes the low range, the filter will spend more
time at the lower frequencies.
SQUARE
SINE
SAW
TRIANGLE
STEP TRI 4
STEP SAW 6
STEP SAW 4
STEP TRI 6
EXP SAW DN
EXP TRI
GTR
EXP SAW UP
RND 1
RND 2
RND 3
RND 4
RND 6
RND 5
Offset = –100
Offset = 0
Offset = +100
Pitch
Offset
Curve
Waveform
