When I was using Melodyne, I found it's so cool and so useful that you can change the background color (bright lanes and dark lanes) from different preference. You can set the background to follow chords, so that the chord note lanes are bright and non-chord note lanes are dark. You can also set the background to follow keys, so that the notes in the current key are shown in bright lanes and the other notes are shown in dark lanes.
But in Studio One's piano roll window, there's no such setting. The background stays the same color as what keyboards are. In most cases, it doesn't do much help.
It will be so great if you can just copy this feature from Melodyne.