A method for combining a first audio signal represented by a first digital data set of samples (A0, A1, A2, A3, A4, A5, A6, A7, A8, A9) and a second audio signal represented by a second digital data set of samples (B0, B1, B2, B3, B4, B5, B6, B7, B8, B9) into a third digital data set of samples (C0, C1, C2, C3, C4, C5, C6, C7, C8, C9) comprising the steps of: - equating each sample of a first subset of samples (A1, A3, A5, A7, A9) of the first digital data set to a neighbouring sample of a second subset of samples (A0, A2, A4, A6, A8) of the first digital data set, wherein the first subset of samples (A1, A3, A5, A7, A9) and the second subset of samples (A0, A2, A4, A6, A8) are interleaved, resulting in a first intermediate digital data set of samples (A0", A1", A2", A3", A4", A5", A6", A7", A8", A9"); - equating each sample of a third subset of samples (B2, B4, B6, B8) of the second digital data set to a neighbouring sample of a fourth subset of samples (B1, B3, B5, B7) of the second digital data set, wherein the third subset of samples (B2, B4, B6, B8) and the fourth subset of samples (B1, B3, B5, B7) are interleaved, wherein the fourth subset of samples (B1, B3, B5, B7) and the second subset of samples (A0, A2, A4, A6, A8) have no samples corresponding in time, resulting in a second intermediate digital data set of samples (B0", B1", B2", B3", B4", B5", B6", B7", B8", B9"); - creating the samples (C0, C1, C2, C3, C4, C5, C6, C7, C8, C9) of the third digital data set by adding the samples of the first intermediate digital data set to the, in the time domain, corresponding samples of the second intermediate digital data set; - embedding the first sample of the first digital data set in the third digital data set. - equating each sample of a first subset of samples (A1, A3, A5, A7, A9) of the first digital data set to a neighbouring sample of a second subset of samples (A0, A2, A4, A6, A8) of the first digital data set, wherein the first subset of samples (A1, A3, A5, A7, A9) and the second subset of samples (A0, A2, A4, A6, A8) are interleaved, resulting in a first intermediate digital data set of samples (A0", A1", A2", A3", A4", A5", A6", A7", A8", A9"); wherein the first subset of samples (A1, A3, A5, A7, A9) and the second subset of samples (A0, A2, A4, A6, A8) are interleaved, resulting in a first intermediate digital data set of samples (A0", A1", A2", A3", A4", A5", A6", A7", A8", A9"); - equating each sample of a third subset of samples (B2, B4, B6, B8) of the second digital data set to a neighbouring sample of a fourth subset of samples (B1, B3, B5, B7) of the second digital data set, wherein the third subset of samples (B2, B4, B6, B8) and the fourth subset of samples (B1, B3, B5, B7) are interleaved, wherein the fourth subset of samples (B1, B3, B5, B7) and the second subset of samples (A0, A2, A4, A6, A8) have no samples corresponding in time, resulting in a second intermediate digital data set of samples (B0", B1", B2", B3", B4", B5", B6", B7", B8", B9"); wherein the third subset of samples (B2, B4, B6, B8) and the fourth subset of samples (B1, B3, B5, B7) are interleaved, wherein the fourth subset of samples (B1, B3, B5, B7) and the second subset of samples (A0, A2, A4, A6, A8) have no samples corresponding in time, resulting in a second intermediate digital data set of samples (B0", B1", B2", B3", B4", B5", B6", B7", B8", B9"); - creating the samples (C0, C1, C2, C3, C4, C5, C6, C7, C8, C9) of the third digital data set by adding the samples of the first intermediate digital data set to the, in the time domain, corresponding samples of the second intermediate digital data set; - embedding the first sample of the first digital data set in the third digital data set.