46
The Editor View
Note that the modulation entries on the
Filter 2
module are kept active so do not forget to disable
them in order to have the desired effect.
Signal routing to the filters
The filter mixers allow one to control how the signal from the different sources, the two oscillators
and the noise source, are routed to the filters.
The amount of signals received by the filters from the the
VCO1
and
VCO2
modules is ad-
justed by the
Vco1
and
Vco2
knobs. These control simply apply a gain factor to the signal received
from the oscillators. The gain is increased by turning the knobs clockwise from a value of zero
(-
inf
dB) to a factor of about 3 (10 dB). In the same way, the amount of signal from the noise
source is adjusted using the
Noise
gain knob.
Finally, signal from the
Filter 1
module can be routed to the input of the
Filter 2
module. The
amount of signal is controlled using the
Filter 1
knob appearing on the mixer of the second filter.
In order to have the two filters strictly in series, this knob should be turned clockwise and the
VCA
1
switched
off
as the output of the first filter is hard wired into the input of the
VCA 1
module. In
this way, the output signal only comes out from the second amplifier after going through the two
filters.
5.3.3
The VCA 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
VCA 1
and
VCA 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 position the sound in the stereo field. The source can
be positioned from left to right by turning the
Pan
knob clockwise; it is 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 across the overall range of the keyboard
can also be adjusted using the
Key
modulation knob. In its center position, the sound level is the
same across the keyboard. Turning the
Key
knob clockwise boosts high notes and decreases the
amplitude of low notes while turning it to the left boosts low notes while decreasing the amplitude
of high notes. Note that the middle C key (C3, MIDI note 60) always sounds a the same level
regardless of the position of the
Key
knob. The output signal from the
LFO
module can be used
for adding a tremolo effect to the sound. This is achieved by using the
VCA Gain
knob on the
LFO
module.
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