Compression Speed in Hearing Aids

This is a wonderful paper written by PhD Brian C. Moore, which explains with clarity the principles of compression (a concept historically present in audio) as applied in modern hearing aids.
Slow-compression and fast compression speed approaches are considered and compared.

The Choice of Compression Speed in Hearing Aids: Theoretical and Practical Considerations and the Role of Individual Differences
Brian C. J. Moore, FMedSci, FRS