I'm sorry to write that, i really don't know what you are doing, but both models but expecially 1.5 is totally degenerated, didn' t follow anymore the prompt, anything you write is ignored completely, all the voices sound very flat and it is impossible to create a chorus that is decent or at least a little different from the verse.
I've tried every way using and changing all the parameters but it's useless. The only way to generate something, the way we would like it, is to load an audio file, otherwise it creates anything less than what you asked for and often sings a completely different lyric.
I love Udio and thanks to you I created some beautiful songs, but I'm really disappointed and I'll probably wait until you improve the system because now it's just a waste of time and credits