Bedienungsanleitung AAS Strum Acoustic GS-1 (Seite 54 von 91) (Englisch)

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54 Parameters

The phaser effects can be controlled with the three knobs appearing at the bottom of the module.

The Mix knob is used to adjust the ratio of “dry” and “wet” signal in the output signal of the module.

When the knob is adjusted in the left position, only the original or “dry” signal is sent to the output

while in the right position only the processed or “wet” signal is sent to the output. The Depth knob

is used to control the amplitude of the effect while the Rate knob is used to ﬁx the modulation

frequency of the effect when the Sync function is off.

6.4.6 Wah

The Multi-Effect module includes 2 different types of wah effects: wah wah, and auto wah. Both

of them are based on a specially designed bandpass ﬁlter with a 12 dB/oct slope. In the wah wah

effect, the center frequency of the bandpass ﬁlter varies at a certain rate. In the case of the auto-

wah, the variations of the center frequency is controlled by the amplitude envelope of the incoming

signal.

The Freq knob is used to control the central frequency of the ﬁlter. Turning this knob clockwise

increases the center frequency. In the case of the Wah Wah effect, the center frequency will oscillate

around the value ﬁxed by the Freq knob while with the Auto Wah effect, the setting of the Freq will

ﬁx the starting point of the value of the center frequency.

The Depth knob controls the excursion of the center frequency of the ﬁlter. In the case of

the Wah Wah effect, this excursion is applied around the value ﬁxed by the Freq knob while in

Auto Wah effect the value of the center frequency increases from the value ﬁxed by the Freq knob.

Turning this knob clockwise increases the excursion of the center frequency.

Finally, the Rate knob controls the frequency or rate of the modulation of the center frequency

of the ﬁlter. In the case of the Wah Wah effect, turning this knob clockwise increases the rate of the

modulation if the Sync function is off. In the case of the Auto Wah ﬁlter, this knob controls the time

constant of the envelope follower. Turning this knob clockwise decreases the time constant, or in

other words the reaction time, of the envelope follower.

6.4.7 Notch Filter

The notch ﬁlter does essentially the opposite of a band-pass ﬁlter. It attenuates the frequencies

in a band located around the center frequency and leaves those outside of this band unchanged as

shown in Figure 24. As was the case for the Wah Wah effect, the ﬁlter is based on a ﬁlter having a

12 dB/oct slope and can be modulated.

The Freq knobs is used to control the central frequency of the ﬁlter. Turning this knob clock-

wise increases the center frequency. The Depth knob controls the excursion of the center frequency

of the ﬁlter around its center frequency. Turning this knob clockwise increases the excursion of the

center frequency. Finally, the Rate knob controls the frequency or rate of the modulation of the

center frequency of the ﬁlter. Turning this knob clockwise increases the rate of the modulation if

the Sync function is off.

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