FR: Make the piano roll powerful!

[cloudspell]

1. Add ghost notes or the shadowy midi notes some of the DAW has that feature it is easy to layer the chord you made and add a melodic lines to it just by looking at the ghost notes.

2. Mute midi notes, for some instances I love the idea of muting some of the notes I input on the piano roll, (maybe for future use or just a trial and error kind of thing for me).

Just a few of my wishlist kind of features I want to see on MuLab on the future.