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A method of processing an audio signal with a content is disclosed. The method comprises determining, based on an analysis associated with a missing fundamental phenomenon, a frequency region suitable for adding one or more harmonic tones of a fundamental tone, determining one or more spectral properties of the content within the frequency region, and adjusting operation of a function for adding harmonic tones based on the spectral properties. Corresponding computer program product, audio signal processing arrangement and electronic device is also disclosed.
