I've noticed that if I use Ctrl+X to mute a note it just makes an X where the fret number was. However if I edit the note and just clicked the mute checkbox then the number remains.

 

So my question is, if I use the Ctrl+X does that keep the fret number note or does it make it a generic open note mute?

Nvm. I got my answer

CTRL+X is designed to remove the fret value of the note and apply string mute status.  SHIFT+X leaves the fret value as it is and adds string mute status.

hey that's useful info! thanks. I'll use Shift+X from now on.