An apparatus for generating a modified audio signal comprising two or more modified audio channels from an audio input signal comprising two or more audio input channels, wherein the apparatus comprises: an information generator for generating signal-to-downmix information, wherein the information generator is adapted to generate signal information by combining a spectral value of each of the two or more audio input channels in a first way, wherein the information generator is adapted to generate downmix information by combining the spectral value of each of the two or more audio input channels in a second way being different from the first way, and wherein the information generator is adapted to combine the signal information and the downmix information to obtain signal-to-downmix information, and a signal attenuator for attenuating the two or more audio input channels depending on the signal-to-downmix information to obtain the two or more modified audio channels, wherein the information generator is configured to process the spectral value of each of the two or more audio input channels by multiplying said spectral value by the complex conjugate of said spectral value to obtain an auto power spectral density of said spectral value for each of the two or more audio input channels, wherein the information generator is configured to combine the spectral value of each of the two or more audio input channels to obtain a combined value, and wherein the information generator is configured to process the combined value by determining a power spectral density of the combined value, characterised in that the information generator is configured to generate the signal information s ( m, k, β) according to the formula: s m, k, β = ∑ i = 1 N Φ i, i m, k β, wherein N indicates the number of audio input channels of the audio input signal, wherein Φ i, i ( m, k) indicates the auto power spectral density of the spectral value of the i -th audio signal channel, wherein β is a real number with β > 0, wherein m indicates a time index, and wherein k indicates a frequency index. an information generator for generating signal-to-downmix information, wherein the information generator is adapted to generate signal information by combining a spectral value of each of the two or more audio input channels in a first way, wherein the information generator is adapted to generate downmix information by combining the spectral value of each of the two or more audio input channels in a second way being different from the first way, and wherein the information generator is adapted to combine the signal information and the downmix information to obtain signal-to-downmix information, and a signal attenuator for attenuating the two or more audio input channels depending on the signal-to-downmix information to obtain the two or more modified audio channels, wherein the information generator is configured to process the spectral value of each of the two or more audio input channels by multiplying said spectral value by the complex conjugate of said spectral value to obtain an auto power spectral density of said spectral value for each of the two or more audio input channels, wherein the information generator is configured to combine the spectral value of each of the two or more audio input channels to obtain a combined value, and wherein the information generator is configured to process the combined value by determining a power spectral density of the combined value, characterised in that the information generator is configured to generate the signal information s ( m, k, β) according to the formula: s m, k, β = ∑ i = 1 N Φ i, i m, k β, wherein N indicates the number of audio input channels of the audio input signal, wherein Φ i, i ( m, k) indicates the auto power spectral density of the spectral value of the i -th audio signal channel, wherein β is a real number with β > 0, wherein m indicates a time index, and wherein k indicates a frequency index. wherein N indicates the number of audio input channels of the audio input signal, wherein Φ i, i ( m, k) indicates the auto power spectral density of the spectral value of the i -th audio signal channel, wherein β is a real number with β > 0, wherein m indicates a time index, and wherein k indicates a frequency index.