Hello! Below and represented by the key of your instrument, you will find an exercise to use against the drone. There are many aspects of this straightforward exercise for you to consider. My suggestions are:
Make music with the drone.
Articulations are in tune.
Ends of notes are in tune.
Take your time
Work on one key a week (minimum)
Contact me for suggestions!
johnstonhorn AT gmail DOT com
(the weird addy is to keep the spam bots away)