Provided is a method for hearing performance assessment of a user wearing a hearing system (10) comprising at least one hearing aid. Said method comprises the steps of picking up (12 12′, 12″) sound from the environment thus providing a signal, processing (16 16′, 16″) the signal thus obtaining a processed signal, and presenting (14 14′, 14″) the processed signal to the user by speaker of the hearing aid. Said processing comprises applying at least one type of modulation to the signal.