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Originally Posted by hobson  oversimplified - but a "sample rate converter" converts your stereo mixdown to 16 bit (CD) - dithering smooths out the low level truncation distortion that occurs when losing those 8 bits of info via conversion. |
Sample rate conversions effect sample rate, for example: converting a 48KHz recording to 44.1KHz.
Dither adds low level noise to keep the last couple bits "moving" (toggling between 1 and 0) which, as you mentioned, helps eliminate low-level distortion.