Piano Roll Editor inconsistency/confusion.
(I'm afraid I might get elected Prince (or dogcatcher) of Piano Roll Editors....)
Create a quarter-note tied to another, over the barline or not.
Go into PRE, and click on the FIRST PART of the note. Set a "len" of 500‰. The upper part of the note will be 500'ded, visibly (in PRE) and audibly (play it back from PRE). While there is a great deal of utility to this interpretation, you "have to know about it". As a matter of fact, even 0 will only blow away the upper portion of the .... what do you call it, "note-complex"?
It shouldn't even really be accepting, or (falsely) reporting len's of non-final-portions of notes.
What I still don't understand is why, when I cut the upper portion from the QML API, it plays correctly, and tells me back (via QML) what I put there, but the PRE still shows 1000 len (and yellow-bar length), although playing what I want it to. I wonder if it cached things thinking that it is the only author of on/off times....