I've read the manual but still can't figure out exactly what the "Side Mix" knob is doing. Is it a L/R mixer? For example, is it doing this:
Out = SideMix * (L+R) + (1-SideMix) * (L-R)
If not, could you describe in equation form what it's doing? Thanks.
It works like this (SideMix is in the range 0 to 1):
GainS = 1.0 - cos( SideMix * M_PI )
GainM = ( 2.0 - GainS ) * ( 0.5 + SideMix )
It was calibrated this way, because side signal is usually quieter, so this formula adds around 6 dB of gain when SideMix is at 100%.
Thanks. I assume GainS and GainM are the relative proportions of the (L-R) and the (L+R) signals, respectively, correct?
If SideMix = 0, then GainS=0 and GainM=1, which means Out=1*(L+R). This would be equivalent to the mono mix.
If SideMix = 1, then GainS=2 and GainM=0, which means Out=2*(L-R). This must be the 6dB you were talking about.
So, if SideMix = 0.5, then GainS=1 and GainM=1, which means Out=1*(L+R)+1*(L-R)=2*L. Is the output then normalized? Or does this get the 6dB boost too?
If SideMix = 0.33, then GainS=0.5 and GainM=1.25, which means Out=1.25*(L+R) + 0.5*(L-R) =~ 1.75*L+0.75*R. This seems like a pretty hot signal. I've got to be missing a normalization factor somewhere.
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