User Guide

4.12 The Output Effect Section 41
The different delay algorithms 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” 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.
In its center position there is in an equal amount of “dry” and “wet” signal in the output signal.
The Depth knob is used to adjust the amount of signal re-injected from the output of a line into the
other one while the Rate knob controls the length of the delay lines and therefore the delay between
echoes.
4.12.4 The Reverb module
The Reverb module is used to recreate the effect of reflections of sound on the walls of a room or
hall. These reflections add space to the sound and make it warmer, deeper, as well as more realistic
since we always listen to instruments in a room and thus with a room effect.
The Reverb drop down menu is used to choose between different reverb algorithms representing
different types of rooms or halls. Each algorithm can be adjusted with the knobs located at the
bottom of the module. The Mix knob is used to set the relative amount of “dry” and “wet” signal
which is related to the proximity of the sound source. The Decay is used to control the reverberation
time of the room. In a real room, the reverberation time is not constant across the whole frequency
range because the walls of the hall are generally more absorbent at high frequencies which results
in a shorter reverberation time for these frequencies. This effect is controlled with the Color knob
which sets the reverberation time of high frequencies relatively to the value of the Decay knob.
4.12.5 Topology
The three effects of the output section can be used in four different configurations as shown in
Figure 14 and where the Chorus, Delay and Reverb modules are labeled A, B, and C respectively.
Figure 14: The four topologies in which the effects can be applied after the Amp module of the
two module rows; A = Chorus module, B = Delay module and C = Reverb module.
In the first two configurations, the left and right channels of both source lines are mixed before
being sent to the output stage. In the first configuration, the Chorus module is first applied, then
the Delay and finally the Reverb module. In the second configuration, the signal is first processed
by the Delay, then by the Chorus and the Reverb module. In the third and fourth configurations, a
different effect is applied after the Amp module at the end of the two module rows, mixing occurs
and the resulting signal is fed to the Reverb module. In the third configuration, the Chorus and