I've already altered the time shadings for v17. Have a look at this.
EDIT: Here are the numbers, if anyone wants to use them now:
HourlyTones = [
Tone.new(-70, -90, 15, 55), # Midnight
Tone.new(-70, -90, 15, 55),
Tone.new(-70, -90, 15, 55),
Tone.new(-70, -90, 15, 55)...