this function will be nice to have in the app.
in some Apps there is a Timeline function(its like your sequnce function) (for example: https://www.sunlitepro.com/de/sunlite.htm). This means I add an MP3 for a show dance and than I can add the sequence or effects in the timeline of the song. So you have the effects at the perfect point of the song.
I hope you understand what I mean.