There is provided a system comprising a first device for neural stimulation (10) of a patient's ipsilateral ear； a second hearing stimulation device (21) using a stimulation mode different from that of the first stimulation device； and a fitting device (13, 15, 31, 33) for adjusting the first stimulation device and the second stimulation device. The first stimulation device comprises a sound processor (11) for generating a neural stimulation signal for each of a plurality of stimulation channels from an input audio signal according to a neural stimulation model including a set of stimulation parameters. The second stimulation device comprises an audio signal processing unit (27) for generating a stimulation signal from an input audio signal according to a stimulation model including a set of stimulation parameters. The system further comprises a memory for storing, for at least some of the stimulation channels, at least one of a hearing threshold neural stimulation signal level, a most comfortable neural stimulation signal level and an uncomfortable neural stimulation signal level. The fitting device comprises a data processing unit (33) for calculating, for at least some audiometric frequencies, at least one of an aided hearing threshold level, an aided most comfortable level and an aided uncomfortable level by taking into account the stimulation model of the second stimulation device, using the values of the stimulation parameters as read from the second stimulation device, and for calculating, for at least some audiometric frequencies, at least one of an aided hearing threshold level, an aided most comfortable level and an aided uncomfortable level from the respective stored hearing threshold neural stimulation signal level, most comfortable neural stimulation signal level and uncomfortable stimulation neural stimulation signal level, respectively, taking into account the stimulation model of the first stimulation device, using the values of the stimulation param
