Bedienungsanleitung AAS Ultra Analog VA-2 (Seite 33 von 66) (Englisch)

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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.

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AAS Ultra Analog VA-2 Seite 33

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