[Xenakios]

I suppose it should be something like :

double leftcopy = *in1;
double rightcopy = *in2;
SimpleCompressor.process(*in1, *in2);
*in1 = leftcopy*(1.0-wetlevel)+*in1*wetlevel;
*in2 = rightcopy*(1.0-wetlevel)+*in2*wetlevel;