1. A hearing aid system comprising a first auditory unit configured to be worn by a user and providing a first auditory perception to the user, the first auditory unit utilizing a first working principle; a second auditory unit configured to be worn by the user and providing a second auditory perception to the user, the second auditory unit utilizing a second working principle, wherein the first auditory unit and/or the second auditory unit are configured to process a related parameter value for a parameter, received from the user, such that an aligned auditory perception between the first auditory perception and the second auditory perception is obtained.