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ARTURIA – MOOG MODULAR V 2.6 – USER’S MANUAL 107
8.2.2 The envelope generator
The envelope generator, connected to the amplifier, is used to “sculpt” the form of a sound
during a cycle, which begins when we press a note on the keyboard, and ends when we
release.
The most current envelope modules use 4 settings that we can vary:
The Attack is the time that the sound will take to reach its maximum volume once the
key has been pressed on the keyboard.
The Decay is the time that the sound will take to decline after the key is played.
The Sustain is the maximum level of volume that the sound will reach when a key is
pressed.
The Release is the decline time after the key has been released.
The ADSR envelope
On the two VCA of the Moog Modular V, the envelopes include 2 supplementary settings:
The Slope Time is the time of intermediary decline situated after the decay, once a key is
pressed.
The Slope Level is the level of intermediary decline situated after the decay, once a key is
pressed.
The envelope generator can also be used to modulate other settings like the cut-off frequency
of a filter or an oscillator for example.
8.2.3 The low frequency oscillator
The LFO (Low Frequency Oscillator) possesses, among other things, the same characteristics
as classic oscillator but does produce frequencies inferior to 20 Hz. In other terms, you won’t
hear the sound if you connect the audio output of an LFO in an amplifier.
Not being used to produce a sound, it can be used to create a cyclic modulation on the
parameter on which it is connected.
For example: if you connect an LFO to the modulation input of an amplifier, the sound volume
will increase and disappear in an alternate manner depending on the speed (the frequency) of
this LFO. This will create a tremolo effect.
To produce a vibrato effect, simply connect the sinusoid output of an LFO to the modulation
input of an oscillator. The frequency of this oscillator will thus be modulated up and then down.
Finally, try to connect an LFO output to the modulation input of a lightly resonant low-pass
filter and you will obtain a wah-wah effect.