What is it?
Resample changes the sound's sample rate and size without changing the way it sounds.

How to use it
Resample from the menu will bring up a dialog box with the following three parameters, Resample, Sample Rate and Sample Size.  The default parameters show the current sample rate and size.

When the Resample check box is selected, the sound will be modified so it sounds the same when the sample rate or size is changed.

The Rate field can have a range of .0001 to 65535.9999 Hertz.

The Rate popup menu has the choice of all the standard sample rates.  The sound input devices available sample rates are highlighted in the list.  If you get sample rate warnings when trying to record, it's because the sound document's sample rate is not one of those highlighted in the list.  You will need to Resample to one of the highlighted sample rates in order to record sounds.

The Size popup menu has the choice of 8 bit or 16 bit samples.

Notes
Going to a lower sample rate will decrease the quality and size of the sound, and going to a higher sample rate will increase the quality and size of the sound.  Going to a higher sample rate will usually eliminate the noise caused by recording at a low sample rate.

Resampling a sound permanently changes it (once saved), even if it's resampled back to the original sample rate and size.