An audio decoding system (100, 300, 400, 500, 600) for processing a two-channel input signal, the audio decoding system comprising a first parametric mixing stage adapted to receive the two-channel input signal and to receive a first set of mixing parameters, the first parametric mixing stage being adapted to output a first two-channel output signal, wherein the first parametric mixing stage comprises: a first decorrelation stage adapted to output a first decorrelated signal based on the input signal, the first decorrelated signal optionally being a one-channel signal; and a first mixing matrix adapted to receive said input signal and said first decorrelated signal, to form a first two-channel linear combination of channels from said input signal and said first decorrelated signal, and to output said linear combination as said first two-channel output signal, wherein coefficients of said first linear combination are controllable by said first set of mixing parameters, and wherein said first set of mixing parameters comprises at least four mixing parameters, wherein the audio decoding system further comprises a second parametric mixing stage adapted to receive the two-channel input signal and to receive a second set of mixing parameters, independent of the first set of mixing parameters, the second parametric mixing stage being adapted to output a second two-channel output signal, wherein the second parametric mixing stage comprises: a second decorrelation stage adapted to output a second decorrelated signal based on the input signal; and a second mixing matrix adapted to receive said input signal and said second decorrelated signal, to form a second two-channel linear combination of channels from said input signal and said second decorrelated signal, and to output said second linear combination as said second two-channel output signal, wherein coefficients of said second linear combination are controllable by said second set of mixing parameters, and wherein said second set of mixing parameters comprises at least four mixing parameters. a first decorrelation stage adapted to output a first decorrelated signal based on the input signal, the first decorrelated signal optionally being a one-channel signal; and a first mixing matrix adapted to receive said input signal and said first decorrelated signal, to form a first two-channel linear combination of channels from said input signal and said first decorrelated signal, and to output said linear combination as said first two-channel output signal, wherein coefficients of said first linear combination are controllable by said first set of mixing parameters, and wherein said first set of mixing parameters comprises at least four mixing parameters, wherein the audio decoding system further comprises a second parametric mixing stage adapted to receive the two-channel input signal and to receive a second set of mixing parameters, independent of the first set of mixing parameters, the second parametric mixing stage being adapted to output a second two-channel output signal, wherein the second parametric mixing stage comprises: a second decorrelation stage adapted to output a second decorrelated signal based on the input signal; and a second mixing matrix adapted to receive said input signal and said second decorrelated signal, to form a second two-channel linear combination of channels from said input signal and said second decorrelated signal, and to output said second linear combination as said second two-channel output signal, wherein coefficients of said second linear combination are controllable by said second set of mixing parameters, and wherein said second set of mixing parameters comprises at least four mixing parameters. a second decorrelation stage adapted to output a second decorrelated signal based on the input signal; and a second mixing matrix adapted to receive said input signal and said second decorrelated signal, to form a second two-channel linear combination of channels from said input signal and said second decorrelated signal, and to output said second linear combination as said second two-channel output signal, wherein coefficients of said second linear combination are controllable by said second set of mixing parameters, and wherein said second set of mixing parameters comprises at least four mixing parameters.