The SOS Matrix is an M x 6 matrix that provides the unscaled coefficients for the M second-order sections that, when cascaded, implement the filter. The Scale values option outputs an M x 1 column vector G, each element of which is essentially a multiplicative gain factor that you can use simply to scale each second-order section so that the overall filter is referenced to 0 dB. So G does not affect the shape of the output waveform or spectrum, but it does affect the scale or level of the output or spectrum.
Does that make sense?
Rick
