Plugin tail size in seconds. - Returning 0.0f means that as soon as your input is silent, the output will be silent. It isn't a special value. - Returning float.infinity means that the host should not optimize calls to processAudio. If your plugin is a synth, or an effect generating sound, you MUST return float.infinity. - Otherwise, returning a particular tail size is the regular meaning.
Override to set the plugin tail length in seconds.
This is the amount of time before silence is reached with a silent input, on the worst possible settings.