Processing:
- a lot of new profiles (including profiles for buses and entire mixes)
- Free-form Transfer Function for sophisticated level-mappings (+ compression templates)
- Style control for different compression styles (clean<>dirty)
- Color control for the Spectral Compression (dark<>bright)
- Spectral Link (limit compression to a certain frequency region)
- Channel Link (gradually process channels independently)
- Auto Release
- Input Riding (keep input level relatively constant after learning)
- sidechain filtering
- Mid/side processing (individual parametrization)
- 5.1 support
- up to 8 user states (A/B)
GUI:
- whole new look and feel
- real-time level histograms with interactive compression grid
- instant impact prediction of compression and spectral compression (see impact of changes on the ENTIRE signal, not only on new samples coming in)
- attack and release highlighting (see changes of attack and release highlighted in signal history when modifying the respective parameters)
- free scaling of the signal history (scale parameter inside metering section)
And basically the whole processing was rewritten and optimized, but that's more or less "invisible" to the end-user. ;)