According to an embodiment, a hearing aid system is disclosed. The system includes a first auditory unit and a second auditory unit, where each unit is configured to be worn by a user. The first auditory unit provides a first auditory perception to the user and utilizes a first working principle. The second auditory unit provides a second auditory perception to the user and utilizes a second working principle. The first auditory unit and/or the second auditory unit are configured to process a related parameter value, received from the user, for a parameter. The processing of the related parameter value results in obtaining an aligned auditory perception between the first auditory perception and the second auditory perception.