Adobe Audition CS5.5 marked a significant milestone as the first version rewritten to run natively on both . This release introduced a high-performance, multi-threaded audio engine that allowed for faster effects processing and lightning-fast batch processing. While it brought major workflow improvements for video editors, it was also noted for being a "rebuild," which initially omitted some legacy features from previous Windows-only versions. Core Workflow & Interface Features
Audition CS 5.5 and the future of Audition - Adobe Community adobe-audition-cs5-5-version-complete