@Jacob and what is interesting is that a similar spike is present in both tracks - you have me intrigued I will see if I can find any others and that would then possibly explain the behavior
Sadly as this next set of samples show the explanation is not necessarily from one element. There is a series of samples from a EAC Secure Ripped copy of the Complete Original Motion Picture Score for Avatar and this is all over the place - sample 5 of 5 being the one that was deemed CD Quality - so not sure what this says?
