Can I add new tasks to a note?

Yes. You can add new tasks to a note that already has existing tasks that have been processed.  However, be careful of these things:

1. All the existing tasks have the Skip Code "|TC|" at the front of the task.
2. The Trigger Tag has been removed from the note.

Why?  It's a long answer, but essentially this prevents us modifying your notes at the same time you're modifying them.  Such conflicts  can be a real pain in OneNote and especially Evernote?