A method including providing an input audio signal in a first path and applying an interpolated head-related transfer function (HRTF) pair based upon a direction to generate direction dependent first left and right signals in the first path; providing the input audio signal in a second path, where the second path includes a plurality of filters and a respective amplifier for each filter, where the amplifiers are configured to be adjusted based upon the direction, and applying to an output from each of the filters a respective head-related transfer function (HRTF) pair to generate direction dependent second left and right signals for each filter in the second path; and combining the generated left signals to form a left output signal for a sound reproduction, and combining the generated right signals to form a right output signal for the sound reproduction.