what I need is an object or a patch that reports me all "held down notes" for each new note-on or note-off event.
The report has to be as pitch and not velocity.
Something like the "borax" object but wich reports me the "held down notes" as midi note-on (pitch).
If I press the midi note 60 I need the patch to report 60.
If I hold down the note 60 and I press 61, I need the patch to report 60 and 61.
If I release the note 60 and keep holding 61, I need the patch to report 61.
That means that for each new event (midi note-on or note-off) I need the patch to tell me what the new situation (in terms of notes held down) is.