copy in this reverb over from fishpolice branch

[kimon-satan]

`double maxiReverbFilters::lpcombfb(double input, double size, double fb, double cutoff)
{
// used for freeverb emulation
// low pass between delay output + feedback
delay_size = size;
output = input + (fb * mf.lopass(delay_line[delay_index],(1.0-cutoff)));
delay_line[delay_index] = output;
delay_index != delay_size - 1 ? delay_index++ : delay_index = 0;
return output;
return 0.0;

}`