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, the related parameter value defines a relative adjustment between a first parameter value associated with the first auditory perception and a second parameter value associated with the second auditory perception; or an adjustment of the parameter value of the auditory unit associated with the parameter where the parameter is only associated with one of the auditory units, and the first working principle and the second working principle are selected from a group consisting of electrical stimulation, mechanical stimulation, acoustic stimulation, optical stimulation, and a combination thereof.