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.