Operation Manual

34 Parameters
center frequency of the filter. Turning this knob clockwise increases the rate of the modulation if
the Sync function is off.
4.9.7 EQ
The EQ provides equalization over the low, mid, and high frequency bands. It is composed of a
low shelf filter, a peak filter, and a high shelf filter in series.
The functioning of the low shelf filter is illustrated in Figure 12. The filter applies a gain factor
to frequency components located below a cutoff frequency while leaving those above unchanged.
The cutoff frequency of this filter is fixed and located at 100 Hz. The amount of gain is controlled
with the Low knob. In its center position there is no attenuation (0 dB). Turning it clockwise boosts
the amplitude of low-frequencies while turning it anti-clockwise reduces it.
The high frequency content of the signal is controlled with a high shelf filter that works in the
opposite manner as the low shelf filter as illustrated in Figure 12. The filter applies a gain factor
to components located above a cutoff frequency while leaving those below unchanged. The cutoff
frequency of this filter is located at 6.4 kHz and the amplitude of the high frequencies is controlled
using the High knob which works similarly to the Low knob.
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 12: Low and high shelf filters.
The mid frequency content of the signal is adjusted using a peak filter as illustrated in Fig-
ure 13. The filter applies a gain factor to frequency components in a band located around the cutoff
frequency of the filter which is fixed at 800 Hz. The gain coefficient is varied with the Mid knob.
When the Mid knob is in its center position there is no attenuation (0 dB). Turning it clockwise
boosts the amplitude of low-frequencies while turning it anti-clockwise reduces it.
4.9.8 Distortion
The Multi-Effect module includes three different types of distortion. The Overdrive effect applies
a smooth symmetrical wave shaping to the input signal resulting in the introduction of odd har-
monics in the signal. The Warm Tube distortion is similar to the Overdrive effect but is slightly