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
Depth slider and field: Determine the modulation amount.
Waveform display: Shows the resulting waveform.
Rate knob and field: Set the frequency of the LFO.
Symmetry/Smoothing knobs and fields: 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.
Phase knob and field: Control the phase relationship between individual channel modulations in stereo signals. At 0, modulation values are reached simultaneously for both channels. At values of 180 or −180, there is the greatest possible distance between the modulation phases of both channels.
Offset slider and field (extended parameter): Set the amount of left or right movement for the modulation (cycle). This results in small or large tremolo variations.