I understand the initial request of this thread.
I think part of the reason many have various suggestions is many do not understand the need to use punch-in.
I have never used punch-in.
When I am working on a specific part, I loop a section, record to a muted track, and play/sing as needed.
And then I comp the proper bits from the multitude of clips.
I know it is easier to work when one has only one option for a part.
But is seems uneccessarily difficult to use punch-in, rather than just recording all takes to a different track.
What am I missing?
j