The problem is your probably looking up MC_LOUD exclusivly
all skills that have statuses attached to them have new entries
in this case
Look in status.c
find
MC_LOUD and the associated status
status->set_sc( MC_LOUD , SC_SHOUT , SI_SHOUT , SCB_STR );
look for sc_shout
if(sc->data[SC_SHOUT])
str += 4;