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Chapter 10 Modulation eects 218
Tremolo eect
Tremolo modulates the amplitude of the incoming signal, resulting in periodic volume changes.
Tremolo is commonly used in vintage guitar combo amps, where it is sometimes incorrectly
referred to as vibrato. The graphic waveform display shows all the parameters except Rate.
Tremolo parameters
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Depth slider and eld: Drag to determine the modulation amount.
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Waveform display: Shows the resulting waveform.
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Rate knob and eld: Rotate to set the frequency of the LFO.
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Symmetry and Smoothing knobs and elds: Rotate to change the shape of the LFO waveform.
If Symmetry is set to 50% and Smoothing to 0%, the LFO waveform becomes rectangular. The
timing of the highest volume signal is then equal to the timing of the lowest volume signal,
with the switch between both states occurring abruptly.
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Phase knob and eld: Rotate to control the phase relationship between individual channel
modulations in stereo or surround signals. At 0, modulation values are reached simultaneously
for all channels. At values of 180 or −180, there is the greatest possible distance between the
modulation phases of the channels.
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Distribution pop-up menu: Choose how phase osets between individual channels are
distributed in the surround eld: “circular,” “left↔right,” “front↔rear,” “random,” or “new random.”
Available only in surround instances.
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Oset slider and eld (Extended Parameters area): Drag to set the amount that the modulation
(cycle) is shifted to the left or right, resulting in subtle or signicant tremolo variations.