rem: virtual std::string parameter_names(void) const { return("change-%"); }
add: string EFFECT_DCFIX::parameter_names(void) const { std::vector<std::string> t;  t.push_back("channel-count");  for(int n = 0; n < static_cast<int>(deltafixes_rep.size()); n++) { t.push_back("delta-ch" + kvu_numtostr(n + 1)); }  return(kvu_vector_to_string(t, ",")); }
context:   virtual std::string parameter_names(void) const { return("change-%"); }