APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario descargar pdf (Pagina 38)

4.4 The Ampliﬁer Module 38

in series, this knob must be fully turned to the right and the level of the Amp 1 set to zero as the

output of the ﬁrst ﬁlter is hard wired into the input of the Amp 1 module. In this way, the output

signal will only come out from the second ampliﬁer after going through the two ﬁlters.

4.4 The Ampliﬁer Module

After ﬁltering, the signal is routed to an ampliﬁer in order to add an

amplitude envelope and panning effect to the sound. Both the Filter 1

and Filter 2 modules have their own ampliﬁer section, the Amp 1 and

Amp 2 modules, which allows one to keep the signal coming from each

ﬁlter totally independent from the other.

The two main controls of the ampliﬁer module are the Level knob

and the Pan knob. The Level knob is used to adjust the overall level of

the ampliﬁer while the Pan knob is used to locate the sound in the stereo

ﬁeld. The source can be positioned from left to right by turning the Pan knob clockwise and it will

be centered when the knob is in its center position.

The level of the sound is always modulated by the signal from the Amp Env module which

is hard-wired to the Amp module. The level of the sound can also be modulated with the pitch

signal from the Keyboard module, which is very handy when it is necessary to adjust the level

of a sound across the overall range of the keyboard. When the inverter button next to the Kbd

knob is in its off position, turning the Kbd knob clockwise will boost high notes and decrease the

amplitude of low notes. Switching the inverter button to its on position will reverse the effect of

the Kbd knob and boost low notes while decreasing the amplitude of high notes when turning the

knob clockwise. When the Kbd knob is in its leftmost position, the amplitude of notes is the same

across all the keyboard. Note that the middle C key (reference note) will always sound a the same

level regardless of the position of the Kbd knob. The output signal from the LFO module can be

used for adding a tremolo effect to the sound.

The pan value can be modulated by signals from the LFO, the Amp Env and the Keyboard

modules. The modulation signals will move the source relative to the source position determined

by the settings of the Pan knob. Negative values of the modulation signal will move the source to

the left of the source will positive values will move it toward the right. The amplitude of the motion

is determined by the amplitude of the modulation signal multiplied by a gain factor controlled with

the LFO, Kbd and Env knobs. In their leftmost position, the knobs will turn off their respective

modulation source while it will be fully effective when the knob is completely turned to the right.

Using the LFO module as a modulation source will move the signal from left to right at the

frequency of the signal from the LFO module. Using the signal from the Env module as the

modulation source will move the source to one side of the source and bring 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 will

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APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario Pagina 38