48
The Editor View
Rate
There are two ways to adjust the rate, or frequency, of the output of the
LFO
module. If the
Sync
switch is in its
off
position, the rate is fixed with the
Rate
knob. When the
Sync
switch is
on
, the
frequency of the oscillator is fixed relative to the frequency (tempo) of the host sequencer or the
master clock (see 5.2.1) in standalone mode. Sync values are adjusted using the
Sync Rate
control
and range from 1/8 of a quarter note (a thirty-second note) to 16 quarter notes (4 whole notes). The
LFO
module can also be synced to a triplet (t) or a dotted note (d). Note that when the
Sync
control
is depressed, the
Rate
knob has no effect.
Phase and Reset Mode
The LFO module behaves in a polyphonic way which means
that a low frequency oscillator is associated with each voice of
the polyphony. This allows the LFO module to control notes
played on the keyboard individually. The gate signal received
from the keyboard is used to reset the
LFO
waveform when a
note is played on the keyboard. The specific point in the wave-
form where the
LFO
module starts generating signal is deter-
mined by the position of the
Phase
knob and whether or not the
LFO
is in reset mode.
The reset mode is enabled by clicking on the
Reset
button. In
this mode, the phase of the output signal of the LFO correspond-
ing to a polyphonic voice is fixed and adjusted with the
Phase
knob. This means that every time a note is depressed on the key-
board and a gate signal is received from the
Keyboard
module,
the
LFO
module starts generating signal for this specific voice
starting at a specific point in the cycle of the waveform. The ini-
tial phase of the signal is determined with the
Phase
knob which
enables one to select values over a full period of the waveform.
The value of the phase lag is increased by turning the knob clock-
wise and is equal to from 0 to 100
%
(0 to 360 degrees). This
feature enables, for example, the triggering of filter sweeps or panning effects that always start at
the same point every time a note is played.
When the
LFO
is not in
Reset
mode (Reset button off), the phase of the signal is random and
determined within a range fixed by the
Phase
knob. Turning this knob clockwise increases the
range to values located at different point of the wave period as explained above. The main interest
of this mode is to keep voices uncorrelated when chords are played. Indeed, the LFO modulation
signals corresponding to the different voices then start at different points even if all the notes are
triggered at the same time. Note that when the
LFO
module is not in
Reset
mode and the
Phase
knob is fully turned to the left (phase of 0 degree), the synthesizer behaves as if the
LFO
was
monophonic and all the voices played were following this single
LFO
.
