A command to add a bandwidth point to each selected FormantGrid.
For examples, see Source-filter synthesis.
To set the bandwidth of F2 at 0.3 seconds to 130 Hz, you set Formant number to 2, Time to 0.3 s, and Bandwidth to 130 Hz.
The formant tier is modified so that it contains the new point. If a bandwidth point at the specified time was already present in the formant tier, nothing happens.
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