A method to operate a hearing device and a hearing device are disclosed comprising a plurality of source units (S1, . . . , Sn). The method comprises the steps of monitoring activities of the source units (S1, . . . , Sn), selecting input signals of active source units (S1, . . . , Sn), processing the selected input signals of active source units (S1, . . . , Sn), and generating an output signal of the hearing device by said processing. According to the present invention, the parameters for controlling said processing are derived from at least one active source unit (S1, . . . , Sn) and/or from at least one selected input signal, respectively. The new technology describes for the first time a hearing device comprising a plurality of source units that are dealt with in automatic manner.