This?
// When songs are canceled, terminated or the character goes out of the
// area of effect, there's an additional effect that lasts for 20 seconds
// Should that time be reset for each song?
// 0: No, you must recast the song AFTER those 20 seconds to have the effect again (Aegis)
// 1: Yes, recasting songs reset the 20 seconds timer (eathena)
song_timer_reset: 0
conf/battle/skill.conf