Vibrato |
The Vibrato plug-in uses frequency modulation to change the pitch of a signal over time.
Apply a simple vibrato
Open the Sonic Foundry Amplitude Modulation dialog.
Choose a preset from the Name drop-down list, or adjust the controls as desired:
a. Drag the Output Gain fader to set the signal level after processing.
b. Drag the Semitones slider to set the maximum range of the vibrato.
c. Adjust the graph as desired to set the waveform of the modulating signal.
d. Drag the Modulation freq. slider to specify the frequency of the modulation period that will be applied to the input signal.
Low
frequencies (0.1 to 2 Hz) create rapid pitch bends. Higher
frequencies (15 Hz and up) modulate the sections so quickly that
instead of hearing pitch changes, new sideband frequencies are heard.
The graph maps a period of an output frequency modulation. The center horizontal line shows where the input and output frequencies are equal. When the envelope is above the horizontal center line, the frequency of the input level will be increased. When the envelope is below the center horizontal line, the frequency of the signal will be decreased.
By adding and adjusting points on the graph, you can create frequency modulation or pitch-shifting effects.
Drag the small boxes (envelope points) up or down.
To create a new envelope point, left-click on any point of the envelope.
To delete an envelope point, single-click it with the right mouse button, or double-click it with the left mouse button.
To move all envelope points, press Ctrl+A and drag when the envelope
has focus (the cursor will be displayed as a 
).
Click the Reset button to reset the graph.
Tips:
Because the envelope represents a period that is repeated at the specified freguency, clicks are likely to occur when the envelope's start and end points do not line up. If you are sure you have drawn the period correctly and still hear transition clicks, select the Blend graph edges check box to apply an edge-smoothing algorithm that will help eliminate the clicks.
Use the center horizontal line as a starting point to balance increases and decreases in signal frequency. Examples of common graph shapes are included as presets.
When the graph is a straight horizontal line, the signal will be pitch-shifted.