The velocity without note is used for polyphonic aftertouch.
Hi ffx
Yes. If you use the current script to sort notes per octaves, after live recording with effect polyphonic aftertouch,will return error to find the first “lost parameter” (actually write a note-off instead,and stops converting the remaining notes).If the code is perfected in the future,also it works for polyphonic aftertoutch.This script does not understand of parameters, simply ordered what is written, but missing the condition of what to do when there are lost parameters (lines with parameters but without note).
The issue is to associate these “lost parameters” with the above note to that affect.In fact, more worrying is to achieve -avoid mistakes-.
To be more precise, you can usepolyphonic aftertouch with MIDI Keyboard after invoking the current script to sort notes per octaves, However, any “lost parameter” generates an error,in any case.
To understand us,I call "lost parameter"any parameter that has no right note beside, in the same line.You can follow this comment(in “Bug 5”). Here is the impasse! 
All this to me is directly related to this topic. If you look well:
[sharedmedia=core:attachments:6762]
…It is very much like this:
[sharedmedia=core:attachments:6738]
