ATRAC was developed for Sony’s MiniDisc format. ATRAC was updated with version 2, then version 3, version 4, version 4.5, and Type R and Type S.
The first major update was ATRAC3 (not to be confused with version 3 of original ATRAC) in 1999. 1
Not confusing at all 🤪
the moment that something touched by a human bias exists, “unbiased” is a loaded term devoid of meaning when we are talking about humans and our information