Hearing aid

A hearing aid is provided which comprise an audio signal input device (11), a signal processor (12) a signal output device (13) which presents a processed audio signal perceivable as sound to an ear of a user, where the signal processor comprises fast acting level estimators (8) and slow acting level estimators (8). According to the invention the fast acting level estimators has attack time constants around 10 ms, and release time constants in the range from 25 ms to 250 ms, and are implemented in a number of frequency bands not exceeding 8 bands and preferably 4 frequency bands, the slow acting level estimators (7) have attack time constants around 10 ms, and release time constants which are 4 to 5 times the release time constants of the fast acting level estimators (8), and are implemented in a number of frequency bands comprising no less than 10 bands and preferably 16 frequency bands. In an embodiment a communication link between two hearing aids at each their ear of a user allows the level estimators between the two hearing aid to synchronize their output.