I don't really think it's something you hear, but it is something you ntoice when it's gone. I don't think usually jitter adds sound. I think of it more as something that doesn't allow the information to be passed correctly...it corrupts the data. When the jitter is lowered, more information is passed correctly, and you hear more of the details cpatured in the original data. When I upgraded my transport I heard more details and more of everything...everything was more realistic and transparent. My old transport still sounds great with the same DAC, but the better transport passes more information intact.