Cannot change voice when moved from another staff
I am trying to clean up a somewhat messy MIDI import. Specifically I moved some notes from treble to bass staff (with Ctrl-Shift-Down). On the treble staff these notes were of voice 2. Voice 1 in bass had two rests of the same duration in the same positions. After the operation I am left with these two unnecessary rests in the bass staff. I am unable to change the voice of my moved notes to 1. The rests cannot be deleted.
When I select one of the moved notes the status bar of the application window would still say it's on staff 1. So does Ctrl-Shift-Down not really move notes to the other staff, but only displays them as such?
A side issue: I am well aware that MIDI lacks the information depth needed to be adequately transformed into music notation. However the situation here seems trivial to me. Why would the import choose treble staff for notes that would easily and more logically fit in the bass? Just curious what the technical issue is here.