How To Tune A Floyd Rose Down A Half Step. Working with the base plate. If it doesn't, you can tune them half step down manually.

Got it for 30 bucks off ebay but i haven't recieved it yet. So if you fret at the 4th fret you've got an ab note so you can tune to it. You just turn the tuning key until the string starts coming out of tune (beyond the sweet spot) and stop when you get to d.