1. An apparatus for determining a spatial output multi-channel audio signal based on an input audio signal, comprising: a decomposer for decomposing the input audio signal to obtain a first decomposed signal having a first semantic property and a second decomposed signal having a second semantic property being different from the first semantic property, wherein the decomposer is adapted for determining the first decomposed signal and/or the second decomposed signal based on a transient separation method, wherein the decomposer is adapted for determining the second decomposed signal comprising the background part of the input audio signal by the transient separation method and the first decomposed signal comprising the foreground part of the input audio signal based on a difference between the second decomposed signal and the input audio signal; a renderer for rendering the first decomposed signal using a first rendering characteristic to obtain a first rendered signal having the first semantic property and for rendering the second decomposed signal using a second rendering characteristic to obtain a second rendered signal having the second semantic property, wherein the first rendering characteristic and the second rendering characteristic are different from each other; and a processor for processing the first rendered signal and the second rendered signal to obtain the spatial output multi-channel audio signal, wherein at least one of the decomposer, the renderer, and the processor comprises a hardware implementation.