Operation Manual

6.102 Vlowpass4 161
sounds, for example, where one wants to close the filter with an upward going envelop such as
during the attack of a note.
Typical Use
A Vlowpass2 can be used as a filter to reduce the high frequencies in a signal, as shown in the
following example :
Figure 103: Use of Vlowpass2 to Reduce High Frequencies.
Or it can be used as a sound source by turning the resonance knob up (clockwise). This gives the
filter a more drawn out response (a longer transient), and generates a sound at the cutoff frequency,
as shown in the following example :
Figure 104: Use of Vlowpass2 to generate Sound.
6.102 Vlowpass4
The Vlowpass4 module is a voltage-controlled fourth-order low-pass filter
(-24dB/octave). This module has three inputs and one output. The first input is
the signal to be filtered, while the second and third inputs are modulation signals
which are used to vary the cutoff frequency of the filter. The amplitude of the
two modulation signals is adjusted with the two gain knobs mod1 and mod2 re-
spectively. The output is the filtered signal. The behavior of this filter module is
exactly the same as that of the Vlowpass2 module except for the attenuation after
the cutoff frequency which is steeper.
6.103 Volume