applied-acoustics-systems ultra analog Manual Do Utilizador
4.3
The Filter Module
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saturation patterns implemented, the three first being symmetrical, meaning that the saturation is
the same for positive and negative values of the signal while for the three remaining the distortion
pattern applied is not the same for positive and negative values of the signal.
the same for positive and negative values of the signal while for the three remaining the distortion
pattern applied is not the same for positive and negative values of the signal.
Input Level
Output
Level
Asym1
Asym2
Asym3
+ Saturation Level (Sym1)
+ Saturation Threshold (Sym1)
− Saturation Threshold (Asym1)
− Saturation Level (Asym1)
Figure 10: Saturation curves of the resonant filters. For asymmetrical curves, the saturation level
and threshold are different for positive and negative values of the input level.
and threshold are different for positive and negative values of the input level.
The distortion algorithms are selected with the Drive drop-down menu and are numbered from
one to three for both symmetrical and asymmetrical saturation. These distortion algorithms range
from very low distortion (clean circuit) to very high distortion.
from very low distortion (clean circuit) to very high distortion.
4.3.7
Slave Filter 2
The Filter 2 module can be enslaved to the Filter 1 module. This can be done by clicking the
Slave toggle switch on the Filter 2 front panel. In this mode, the frequency of the Filter 2 module
follows exactly that of the Filter 1 module. The Cutoff knob on the Filter2 module is then used
to adjust the offset frequency between the Filter 1 and Filter 2 modules. When slaved, the cutoff
frequency of Filter 2 module will follow exactly that of the Filter 1 module including the effects
of the modulation signals from the keyboard, LFO or envelope generator acting on the Filter 1
module. Note that the modulation entries on the Filter 2 module are kept active so do not forget to
disable them (modulation knobs in the left position) in order to have the desired effect.
Slave toggle switch on the Filter 2 front panel. In this mode, the frequency of the Filter 2 module
follows exactly that of the Filter 1 module. The Cutoff knob on the Filter2 module is then used
to adjust the offset frequency between the Filter 1 and Filter 2 modules. When slaved, the cutoff
frequency of Filter 2 module will follow exactly that of the Filter 1 module including the effects
of the modulation signals from the keyboard, LFO or envelope generator acting on the Filter 1
module. Note that the modulation entries on the Filter 2 module are kept active so do not forget to
disable them (modulation knobs in the left position) in order to have the desired effect.
4.3.8
Series/Parallel
Even if the two filters are patched in parallel, there is an additional signal path used to route the
output of the Filter 1 module into the input of the Filter 2 module. This feature enables one to put
the two filters in series.
output of the Filter 1 module into the input of the Filter 2 module. This feature enables one to put
the two filters in series.
The amount of signal from the Filter 1 module injected into the Filter 2 module is adjusted
with the help of the To F2 knob on the Filter 1 module front panel. In order to put the two filters