User Manual

4.3. The filter and its envelope
The result of the mixing of different sources of sound is directed towards a resonant filter
with a slope of 24dB per octave.
The “Cutoff frequency” knob sets the cut-off frequency. The “Emphasis” knob sets the level
of resonance and “Amount of Contour” the action of the envelope generator associated to
the filter.
It should be noted that this filter auto-oscillates, which is to say that when the resonance is
set to the maximum, the filter generates a signal close to sinusoid even in the absence of
an input signal. Nonetheless, a weak noise signal as filter input brings us a little closer to
the results obtained with the original synthesizer. In fact, electronics can never guarantee a
perfect zero level to the filter input as is the case with a virtual reproduction.
The envelope generator associated to the filter can be adjusted with the “Attack Time” knob
for the attack time, and the “Decay Time” knob for the decay time, and the “Sustain Level”
knob for the level of sustain.
Unlike other envelope generators, there is no separate setting for the time to return to zero.
This time is the same as the decay time but can be activated or deactivated with the “decay”
switch situated on the left of the keyboard. When it is deactivated, the return time to zero
for the generator is practically zero.
The two “Keyboard control” switches allow the use of a key follow at the filter cut-off
frequency.
When they are set to the “OFF” position, no key follow is connected.
When the first is “ON”, the key follow allows the modification of the cut-off frequency by a
major third for an octave.
When the second is “ON”, the key follow is of a fifth for an octave, and when both are “ON”,
the filter cut-off frequency exactly follows the keyboard. It should be noted the pivot note is
F0.
Filter parameters
Envelope generator associated to the filter
39 Arturia - User Manual Mini V - THE SYNTHESIZER