A command to add a formant point to each selected FormantGrid.
For examples, see Source-filter synthesis.
To set the value of F2 at 0.3 seconds to 2200 Hz, you set Formant number to 2, Time to 0.3 s, and Frequency to 2200 Hz.
The formant tier is modified so that it contains the new point. If a formant point at the specified time was already present in the formant tier, nothing happens.
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