I always took it as meaning; If I made any changes to unfrozen tracks it's going to regenerate every unfrozen track. And, if I have not made any changes it's just going to replay the previous arrangement.
So, if I have not made any changes, and I am intending to regenerate for a new arrangement (for different drum rolls, for example), pressing the play button will not get the results I want.
It reminds me to press the regen button and also check what I have frozen.


Does the noise in your head bother me ?