”Data formats are converted constantly - take the internet for instance, and yet you don't see massive errors for the same reason you don't see massive errors in digital audio - error correction schemes.”

Digital audio (S/PDIF) does not use error correction. The S/PDIF receiver/decoder uses error concealment by repeating the last known good bit from a small buffer (up to 20 bits before dropping a frame) or in the case of a bad CRC a dropped 32 mSec audio frame.