Not sure how to do it with an app. But very easy to do with a DAW. In Sibelus just find the root note, and notate it as long as you possibly can. If it repeats it will still sound good but you really want a never ending note. I've worked with drones in music before and typically you want to use a bass note. High end drones work but don't sound as droney.
Oh and chord drones, just notate the chord and have it held for as long as possible.
Thats pretty much it, drones are pretty easy to do.
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