AAS ULTRA ANALOG VA-3, Руководство пользователя

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5.3 The Synth View 47
The pan value can be modulated by signals from the LFO , the Amp Env modules and the
pitch of the note played. The modulation signals moves the source relative to the source position
determined by the settings of the
Pan knob. Negative values of the modulation signal move the
source to the left of the source while positive values move it toward the right.
Using the LFO module as a modulation source moves the signal from left to right at the fre-
quency of the signal from the LFO module. This is achieved by using the VCA Pan knob on the
LFO module. Using the signal from the Env module as the modulation source moves the source
to one side of the source and brings it back to its original position. Note that since the sign of the
envelope signal is always the same, the source would need to be positioned completely to the left
or to the right (
Pan
knob in its leftmost or rightmost position) in order for the source to sweep the
entire space. Finally, the pitch signal from the keyboard positions 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.
5.3.4 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.
5.3.5 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.