A command in the New menu to create an empty FormantGrid object.
Settings

Start time (s)

End time (s)

the time domain of the resulting FormantGrid.

Number of formants (e.g. 10)

the number of formants in the resulting FormantGrid. For instance, if you set this to 10, the resulting FormantGrid will contain 10 formant tiers (for F1 through F10) and 10 bandwidth tiers (for B1 through B10). Each of these 20 tiers will contain one point.

Initial first formant (e.g. 550 Hz)

the frequency value of the single formant point in the first formant tier. Because of constant extrapolation, F1 will have this value throughout the time domain.

Initial formant spacing (e.g. 1100 Hz)

the difference between the frequency values of the points in adjacent formant tiers. For instance, the example values mentioned here cause F2 to be 1650 Hz throughout the time domain; F3 will be 2750 Hz, F4 will be 3850 Hz, and so on.

Initial first bandwidth (e.g. 60 Hz)

the value of the single bandwidth point in the first bandwidth tier. Because of constant extrapolation, B1 will have this value throughout the time domain.

Initial bandwidth spacing (e.g. 50 Hz)

the difference between the values of the points in adjacent bandwidth tiers. For instance, the example values mentioned here cause B2 to be 110 Hz throughout the time domain; B3 will be 160 Hz, B4 will be 210 Hz, and so on.
To add some points to it, use FormantGrid: Add formant point... and FormantGrid: Add bandwidth point....
For more examples, see Sourcefilter synthesis.
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