When should I apply dithering?
The basic rule-of-thumb is that you should dither when moving to a lower bit resolution. One obvious instance of this is when converting an audio file to a lower resolution (e.g. preparing a 24-bit file for mastering to CD, which uses 16-bit format).
However, even if you're playing back or rendering a 16-bit file to the same resolution, you need to dither if you're using any real-time processing whatsoever in WaveLab! The reason for this is that WaveLab works with an internal resolution of 32-bit (floating point), for supreme audio quality. This means that as soon as you perform any kind of real-time processing, the audio data will be treated at this high resolution instead of the original 16 bits, thus making dithering necessary.
klistrat från Wavelab helpen. (antar att det även gäller Cubase)