All .CAL duplicate removers I have found may miss duplicates in polyphonic selections if notes are not consecutive.
And I am getting Out of range errors on some tracks with rogeriodec's UNOVERLAP.CAL (maybe caused by duplicates).
So I made a merged polyphonic version of UNDUPE and SINGLE, removing duplicates and overlaps.
 
If you need it, Download here: CleanTrack
 

Could prove useful thanks

Man, your script is a simple, elegant and a definitive solution.
I'm just learning CAL and dealing with all the limitations of it.
But in fact, I tested your script with various combinations and it works perfectly.
Thank you very much for your cooperation.
I will change my post about UNOVERLAP.CAL to indicate that the correct solution is your script.

Thanks Rogerio, glad if it comes to use!
And there is no "correct" solution, UNOVERLAP.CAL works nicely, probably faster.

sweet  keep'em coming!