Abstract: A method of processing a signal in a hearing aid (50) comprising the steps of determining a gradient of a speech intelligibility measure using a closed form expression of the gradient and modifying the frequency dependent hearing aid gains in dependence on the calculated gradient. The invention also provides a hearing aid (50).

Abstract: A hearing aid (1) comprises a housing, two microphones (3, 4), signal processing means provided with user selectable settings, and a receiver. The housing is provided with mechanical sound generating means (5, 11). The sound generating means is capable of providing a specific sound when manipulated by a hearing aid user. The sound generating means is arranged such that the two signals (25), obtained from the specific sound being recorded by the two different microphones (3, 4) will have a negative correlation, making said specific sound identifiable by said signal processing means. The signal processing means are arranged for selecting a specific setting dependent on one or more sounds generated by the sound generating means (5, 11). The invention further provides a method for selecting a setting of a hearing aid.