Apparatus for generating a multi-channel audio signal based on an input audio signal , comprising: a main signal upmixing means configured to provide a main multi-channel audio signal based on the input audio signal ; a section selector configured to select a section of the input audio signal based on an analysis of the input audio signal to obtain a selected section of the input audio signal , wherein the selected section of the input audio signal , a processed selected section of the input audio signal or a reference signal associated with the selected section of the input audio signal and which replaces the selected section of the input audio signal , is provided as a section signal ; a section signal upmixing means configured to provide a section upmix signal based on the section signal ; and a combiner configured to overlay the main multi-channel audio signal and the section upmix signal to obtain the multi-channel audio signal , wherein the apparatus further comprises a section signal memory configured to store the section signal or a processed section signal, wherein the section signal upmixing means is configured to provide a defined number of section upmix signals based on the stored section signal or the stored processed section signal, wherein the defined number of section upmix signals is determined by a density parameter, or wherein the apparatus further comprises a controller configured to deactivate the section selector , the section signal upmixing means , or the combiner , so that the multi-channel audio signal is equal to the main multi-channel audio signal , wherein the controller is controlled by a control parameter contained in the input audio signal or controlled by a user interface. a main signal upmixing means configured to provide a main multi-channel audio signal based on the input audio signal ; a section selector configured to select a section of the input audio signal based on an analysis of the input audio signal to obtain a selected section of the input audio signal , wherein the selected section of the input audio signal , a processed selected section of the input audio signal or a reference signal associated with the selected section of the input audio signal and which replaces the selected section of the input audio signal , is provided as a section signal ; a section signal upmixing means configured to provide a section upmix signal based on the section signal ; and a combiner configured to overlay the main multi-channel audio signal and the section upmix signal to obtain the multi-channel audio signal , wherein the apparatus further comprises a section signal memory configured to store the section signal or a processed section signal, wherein the section signal upmixing means is configured to provide a defined number of section upmix signals based on the stored section signal or the stored processed section signal, wherein the defined number of section upmix signals is determined by a density parameter, or wherein the apparatus further comprises a controller configured to deactivate the section selector , the section signal upmixing means , or the combiner , so that the multi-channel audio signal is equal to the main multi-channel audio signal , wherein the controller is controlled by a control parameter contained in the input audio signal or controlled by a user interface. <EOS>