Operation Manual

4.6 The Effect Module 34
4.6.2 Flanger
The flanger effects is controlled with the three knobs appearing at the bottom of
the module. 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.
4.6.3 Delay
The Effect module includes 3 different types of delay effects: Ping Pong, Digital
and Tape Delay. The Digital delay consists in a standard delay line with feedback.
The tape delay is similar but also includes a low-pass filtering effect in order to
simulate the attenuation of high frequencies in analog tape delays. The Ping Pong
delay is based on two delay lines resulting in a signal traveling from one channel
to the other, each time attenuated by a coefficient.
The Feedback knob is used to adjust the amount of signal re-injected into the
delay lines or in other word the amount of feedback introduced in the line. In
its leftmost position, there is no signal re-introduced and the effect module only
delays the input signal. Turning this knob clockwise increases the amount of signal
reflected back at the end of the line. Finally the Time knob controls the length of
the delay lines and therefore the delay between echoes.
4.6.4 Phaser
The “phasing” effect colors a signal by removing frequency bands from its spec-
trum. The effect is obtained by changing the phase of the incoming signal and
adding this new signal to the original.
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.
4.6.5 Wah
The 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 Depth knob controls the excursion of the center frequency of the filter.
Turning this knob clockwise increases the excursion of the center frequency.