getTailSize

Reports to the DAW the length of a tail your plugin makes (in samples).

Let's say you're making a reverb or delay with a 1 second tail. Depending on the sample rate, the number in samples that you'd report here would be 48000 or 96000 etc.

If you're making a tone generator or a synth, put -1 here (meaning your tail can be infinite).

In other cases, when your plugin doesn't leave a tail, you can omit this function or return 0.