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AAS Ultra Analog VA-2 Manual

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32 Parameters
notes depending on their pitch, low notes to the left and high notes to the right where the middle C
is the reference note positioned at the location determined by the Pan knob.
4.2.4 The Noise Generator Module
The Noise module generates white noise and is followed by a -6dB/Oct low-pass filter used to
adjust the frequency content of the noise. The Color knob is used to vary the cutoff frequency of
the built-in low-pass filter. Turning this knob to the right increases this frequency and therefore
increases the high frequency content of the noise until, in its rightmost position, the filter is fully
opened. The Noise knob on the filter mixers is used to control the amount of noise sent to each
filter.
4.2.5 The LFO Module
The LFO module is used as a modulation source for the Oscillator, Filter and Amplifier modules.
On the LFO module, one can adjust the waveform, the phase of the signal and fade-in behavior.
Wave Shape
The waveform of the LFO is selected with the Shape drop-down menu. The possible values are
Sine for sinus, Tri for triangular, Rect for rectangular and Rnd and Rnd 2 for the two random modes.
In the case of the triangular and rectangular waves, the PW (Pulse Width) knob is used to control
the symmetry of the wave. This allows one to go from a pulse to a square wave when a rectangular
waveform is selected, and from a saw-tooth to a perfectly triangular wave when the triangular
waveform is selected. Note that the PW knob has no effect on the Sine, Rnd and Rnd 2 waveforms.
When the Shape control is set to rnd, the LFO outputs random values at the rate determined by the
Sync control or the Rate knob. In this case, the output value from the LFO remains constant until
a new random value is introduced. The Rnd 2 mode reacts almost like the preceding mode except
that the LFO module ramps up or down between successive random values instead of switching
instantly to the new value.
Rate
There are two ways to adjust the rate, or frequency, of the output of the LFO module. If the
Sync control is in its off position, the rate is set with the Rate knob. When the Sync control is
on, the frequency of the oscillator is fixed relative to the frequency (tempo) of the master clock
(see 4.4.1) and the value displayed in the Sync control. Sync values range from 4 whole notes (16
quarter notes) to a thirty-second note (1/8 of a quarter note) where the duration of the whole note
is determined by the value (in BPM) appearing in the Tempo display of the Clock module. The
LFO module can also be synced to a triplet or a dotted note. Note that when the Sync control is
depressed, the Rate knob has no effect.
… 32 …


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