A hearing aid system (100) comprises a hearing aid (102) and an external device (101). The hearing aid (102) has link means for providing a wireless link with the external device (101), memory means for storing a hearing aid variable and signal processing means for initiating the logging in response to a trigger signal received from the external device (101) The external device (102) has link means (107) for providing the wireless link with the hearing aid (102), an input transducer (103) for providing an electrical audio signal, memory means (105) for storing a sample of the electrical audio signal, user input means (106) and signal processing means (104) configured for initiating the recording of the electrical audio signal sample and for initiating the transmission of the trigger signal to the hearing aid (102) in response to an activation of the user input means (106). The invention further provides a method of fitting a hearing aid system (100).