I'm curious, because I don't know about dithering.
A quick definition states that white noise is added to reduce low amplitude distortion.
I've only come across it as a setting in my Amarra player.
As I understood, from Sonic Frontier, it could help keep the audio signal from being garbled when changing the source volume in software.
Although I like and use Amarra, the dithering settings did not prevent a track that is playing from becoming garbled while adjusting the volume slider.
I could not hear a difference otherwise.
Is this a Foobar2000 setting?