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38 Parameters
factor to components located above a cutoff frequency while leaving those below unchanged. The
cutoff frequency of this filter, located above 1 kHz, is adjusted with the help of the Freq knob
while the gain factor applied to the signal, in a ±15dB range, is adjusted using Gain knob. In its
center position there is no attenuation (0 dB). Turning it clockwise boosts the amplitude of high
frequencies while turning it anti-clockwise reduces it.
Amplitude (dB)
0dB
Freq Frequency (Hz)
Amplitude (dB)
0dB
Frequency (Hz)Freq
Gain = −30 dB
Gain = 10 dB
Gain = 20 dB
Gain = 30 dB Gain = 30 dB
Gain = 20 dB
Gain = 10 dB
Gain = −30 dB
Figure 19: Low and high shelf filters.
The EQ module features two peak filters, labeled LMF and HMF, allowing to shape the signal
in two frequency bands as illustrated in Figure 20. The filters apply a gain factor to frequency
components in a band located around the cutoff frequency of the filters. This cutoff frequency is
adjusted using the Freq knob and can vary between 100 Hz and 10 kHz. The gain factor applied
a the cutoff frequency is controlled by the Gain knob and can vary in a ±15 dB range. When
in its center position there is no attenuation (0 dB). Turning it clockwise boosts the amplitude of
frequencies located around the cutoff frequency while turning it anti-clockwise reduces it. The
Q knob is used to adjust the so-called quality factor of the filter which controls the width of the
frequency band on which the filter is active. In its leftmost position, the frequency band is wide
and it gets narrower as the knob is turned clockwise.
The SC button (side-chain) is used to determine if the output from the EQ module is to be used
as the control signal of the Compressor module as described in Section 4.3.2. Finally, note that all
the gain knobs from this module can be accessed directly from the Play view.
4.3.2 Compressor
The Compressor module is used
to automatically compress, in other
words reduce, the dynamics of a sig-
nal. This module receives two input
signals. The first one is the signal to be compressed while the second one is a control signal which
triggers the compression process when it rises above a given level.
38


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