The jitter problem that is usually stated is when the transport's clock is not clean, or is corrupted by noise and distortion, and is used directly as the clock for the DAC.
would you say this is an area where digital cables can make a difference?
I cannot remember who made it, but years ago I heard a CD player that first pulled the data off into a memory then began playback. After endless outcry from those who did not like waiting minutes for it to start playing, the designers were apparently made aware of dual-port memory and released a new version that started playing after a short period to load a few seconds worth of data so the music could play on whilst the rest of the disc was being read. It was still a bit distracting as the rapidly-spinning CD transport could still be heard if you were near the player until it pulled all the data off.
Right, we have discussed products like the http://www.thememoryplayer.net/ here in the past...