Working with Melodyne to fix 3 part 3 track harmonies. I did quick fix  and am now fine tuning cross fades and consants, etc.  On the same track, different clip, create region effect is disabled on some clips and not others.  Whats up with that?  The clip isn't locked, and is not specific.  VocalSync RegFX  Creaat is also disabled.    What is aberrant about the clips where create is greyed out?   Thanks!