It is already known that a music file can have jitter introduced into it as the bits are reconstructed due to slight timing errors in detecting where it transitions from a 0 to a 1, or from a 1 to a 0. This has me wondering if a downloaded file can suffer the same fate. The packet will undergo a number of transitions such as electrical to optical to electrical as it travels through the net. When it hits a router it will go from Ethernet to an internal format and back to Ethernet as it leaves the router. While the CRC will be correct it certainly seems possible jitter can be introduced into the file.
At least that is my current thinking, but I have no idea how to test it. Maybe if there were a way to get the HD file on a USB drive and compare it with test equipment (and listening) to the downloaded version that might be a method.
Any ideas? Does this make sense?