Operation Manual

4.2 The Edit View 33
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
waveform where the LFO module starts generating signal is
determined 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 corre-
sponding to a polyphonic voice is fixed and adjusted with the
Phase knob. This means that every time a note is depressed
on the keyboard and a gate signal is received from the Key-
board module, the LFO module starts generating signal for
this specific voice starting at a specific point in the cycle of the
waveform. The initial 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 clockwise 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.
Fade-In
One more feature of the LFO module is the possibility to add a fade-in effect to its output signal.
The duration of this fade-in can be adjusted within the range of 0 to 5 seconds, as determined by
the Fade knob. Turning this knob fully to the left results in a value of 0 which is equivalent to
removing the fade-in effect. The time at which the LFO signal is introduced can even be controlled
by adding a delay to the fade in. This parameter can also be set to values varying between 0 and 5
seconds, as determined by the Delay knob. Note that this knob is effective even if the Fade value
is adjusted to zero. In this case, the signal from the LFO module si simply delayed.