gain=law*sqrt(2)* (1.0 + (sqrt(2) * 0.5 / law - 1)/(sqrt(2)-1) * (1/cos(panpos*0.25*PI)-1.0))

leftscale = cos((panpos+1.0)*0.25*PI)*gain;
rightscale = sin((panpos+1.0)*0.25*PI)*gain;