668     sox_signalinfo_t * in, sox_signalinfo_t const * out, int * guard) {  in add_effect()  argument
670   switch (*guard) {  in add_effect()
674       ++*guard;  in add_effect()
680       --*guard;  in add_effect()
693     char *argv[], sox_signalinfo_t *signal, int * guard)  in auto_effect()  argument
702   if (add_effect(chain, effp, signal, &ofile->ft->signal, guard) != SOX_SUCCESS)  in auto_effect()
1038   int guard = is_guarded - 1;  in add_effects()  local
1055           &guard) != SOX_SUCCESS)  in add_effects()
1063     auto_effect(chain, "rate", rate_arg != NULL, &rate_arg, &signal, &guard);  in add_effects()
1065     auto_effect(chain, "channels", 0, NULL, &signal, &guard);  in add_effects()
1067     auto_effect(chain, "rate", rate_arg != NULL, &rate_arg, &signal, &guard);  in add_effects()
1072     args[0] = do_guarded_norm? "-nh" : guard? "-rh" : "-h";  in add_effects()
1075     guard = 1;  in add_effects()
1080     auto_effect(chain, "dither", 0, NULL, &signal, &guard);  in add_effects()
1083   for (; i < nuser_effects[current_eff_chain]; i++, guard = 2) {  in add_effects()
1085           &guard) != SOX_SUCCESS)  in add_effects()