I rarely work like that....

BUT.. if you do something that doesn't work.... and haven't gone too far... the sooner you realize you don't like something the better.... use the EDIT > UNDO to go back. I'm not sure, but I think it drops the edit list when you close the program so get it before you shut it down. Also.... if you've done a few other things before you catch the mistake and use the EDIT>UNDO you will have to redo the things after the mistake.

How to get it to start with pickup notes.... on 3.... Sometimes it does and sometimes it doesn't. Regenerate the track with the pickup or record it live.

You can find my music at:
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.