Tremolo controls in Final Cut Pro
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 parameters except Rate.
For information about adding the Tremolo effect to a clip and showing the effect’s controls, see Add Logic effects to clips in Final Cut Pro.
Sync button: Synchronize the modulation speed with the project tempo. Choose musical note values with the Rate knob.
Rate knob and field: Set the frequency of the low-frequency oscillator (LFO).
Depth knob and field: Determine the modulation amount.
Smoothing slider and field: Change the shape of the LFO waveform. Also see the description of the Symmetry parameter, below.
Distribution pop-up menu: Choose how phase offsets between individual channels are distributed in the surround field. Choose Circular, Left↔Right, Front↔Rear, Random, or New Random. Available only in surround instances.
Offset field: Set the amount of left or right movement for the modulation (cycle). This results in small or large tremolo variations.
Symmetry field: Skew the balance toward the upward or downward phase of waveform cycles.
Note: 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 field: 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.
Waveform display: Shows and lets you edit modulation Offset, Symmetry, and Phase. Modulation is represented by a repeating waveform cycle for each channel. The height represents the LFO intensity, or depth. Adjust the Depth knob to change the LFO intensity. Two green handles and two blue handles let you control Offset, Symmetry, and Phase values.
Offset: Drag the field or the green handle at the left of any waveform cycle to set the left or right modulation movement.
Symmetry: Drag the field or the green handle at the right of any waveform cycle to set the balance between upward and downward waveform phases.
Phase: Drag the field or either blue handle of any waveform cycle to control the phase relationship between channel modulations.