You probably already know this seeing as your a high level bard but for those who don't yet. The song will take effect if you turn it off and start the next when the cast bar is at the final 5-8% (rough estimate). When I'm doing the 4 song twist I never let the cast bar go all the way to the end before clicking off. If you do then you get the dropped song often. Only time I get a dropped song is when either the cast bar vanishes or I get a missed note. Also If my hand starts cramping up after many hours.
It might even be as high as 10% left on the cast bar. I just have a sense for it now so I can't say for sure.
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