The purpose of the invention is to bridge the gap between parametric multi channel audio coding and matrixed surround multi channel coding by gradually improving {HEAD ~ the sound} of an up mix signal while raising the bit rate consumed by the side information starting from 0 up to {TAIL ~ the bit rates} of the parametric methods 
The purpose of the invention is to bridge the gap between parametric multi channel audio coding and matrixed surround multi channel coding by gradually improving { HEAD ~ the sound } of an up mix signal while raising the bit rate consumed by the side information starting from 0 up to { TAIL ~ the bit rates } of the parametric methods
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