How to set Dance's / Song's

Hi , i have a problem, i have a group with SwS / BD / PW / WC ..
all works fine until one thing:/
I have problem with dance's & song's. How can i set a script to make my SwS / BD sings dances at the same time? Without lose many XP? Im tried to search it but i couldn't find something helpfully about that. I set my BD / SwS to sing dance every 120s in fight , but this is not a good idea when my tank (SwS) get a target and hit it he lose some of second to make a song:/
Thank You by the way guys... you help me a lot!!!All of this run on Gracia Part II.

im to tired to think about it now ... maybe in the morning ... till then moved

wrong section - moved,warning

Sorry i make a mistake...
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wirte here in this thread and dont create other ones ...

did u try to set it to sing not every 120 s but 118 maybe so if hes attacking a mob there is a few sec reserve time ?

I tried this but when its don't in fight mode, lose a lot MP because the fading buff slot is on 1sec till worn off. The only way to fix with different way is to make the SwS pick up Herb of Mana. After 5min of xping my SwS/BD make songs/dances with some of delay , like they started together but after lose timing method:/
Ty btw emir0n to answer me :)

try setting songs to self buffs and set them to 128 if your doing 2 of each, dont check auto detect, use the in-fight button.