UDO Super Gemini — Owner’s Manual
42
VCA (Voltage Controlled Amplifier)
After being shaped by the filter, the audio signal passes on to the voltage-
controlled amplifier (VCA). The Super Gemini’s VCA section can be used to
further shape the sound by modifying and modulating its volume.
By default, the level generated by the VCA is controlled by envelope 2
(ENV 2), which gives you control over the attack, decay, sustain, and
release stages. On pages 50-51 you can read more about how the VCA
level can be modulated by the dedicated envelope. Alternatively, the VCA
level can be controlled by one of two fixed envelopes, allowing the second
envelope to be freed up for other tasks if desired.
The VCA section.
ENV LEVEL:
This fader controls the amount by which envelope 2 or one of
the fixed envelopes modulates the VCA level over time.
LFO 1:
This fader controls the amount by which LFO 1 modulates the VCA
level. This parameter is useful for tremolos, as the volume increases and
decreases according to the rate of LFO 1. Use a triangle wave for smooth
tremolo effects and a square wave for abrupt tremolo effects.
DDS 2:
This fader controls the amount by which DDS 2 modulates the
VCA level. The resulting amplitude modulation can generate anything from
subtle textures to clangourous timbres.
The envelope selector toggle switch allows you to choose between three
types of VCA envelopes:
• Lower position:
With this setting, envelope 2 acts as the modulation
source. This is the default setting, which means that the second
envelope is usually responsible for modulating the VCA level.
• Middle position: With this setting, the first of the fixed envelopes acts
as the modulation source. Its attack, decay and release stages have no
duration, meaning it acts as a simple on/off envelope or gate.
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