Finally fixed that weird problem with Ray-V having a weird distortion
at certain filter settings.  After some careful GDB'ing, it turns out
that after each sample, the cutoff was fluctuating by 2 octaves because
that cutoff_mod variable wouldn't be reset to zero, and would then
double itself.  That had to have been the most irritating long standing
bug in the whole project...

Tests showed that there was no regressions caused in any other
plugins by this...  a veritable "home run"...