Operation Manual

6.89 Tremolo 147
Timbre
The timbre of the output of the tone wheel can be varied with the flute reed selector. In the left
position, the module outputs a sine-like tone. As the selector is turned to the right, the signal gets
distorted and evolves toward a triangle-like tone as its harmonic content increases.
Typical Use
Tone wheel modules are usually used in parallel. In the example of Figure 89, three modules
are connected to a polyphonic Keyboard module. Each of the Tone wheel module is tuned to a
different note in order to create a complex tone. The amplitude of every component of the tone can
be adjusted with a Volume slider reproducing drawbars on hardware organs.
Figure 89: A simple polyphonic organ.
6.89 Tremolo
This module has one input and two outputs. It applies a tremolo effect to
the input signal and outputs the resulting signal on the two outputs.
A tremolo effect consists in modulating the amplitude of a signal with a
low frequency wave. The speed and depth knobs of the front panel is used to
adjust the speed and depth (frequency) of the modulation wave respectively.
The waveform selector is used to switch between a triangle and square modu-
lation signal. With the mono/stereo switch in stereo position the tremolo will
bounce with a 180 degrees phase from left to right. When the switch is on
mono the left and right output signals are the same. The on switch is used to
switch the tremolo on or off. The red LED indicates the speed of the vibrato.