Puzzle Fifty-One: How Did They Do That? (meta)

The answer to this month's meta challenge is a nine-letter word. 

Submit your answers at before Tuesday, March 29 at 12 PM EST at https://forms.gle/GEshTDoTqReko9JS9

And here's something new I'm testing out. Before you submit your answer, you can make sure it's correct by using the following answer checker link:

https://www.callingit.in/1/#mvgfpQbsfBUAS3/C-rANlgUcXggCAAq8q9NPFkfVei2244GdZ-SG93IERpZCBUaGV5IERvIFRoYXQ/

I've also been posting some mini-metas for #enigmarch in this Twitter thread (SPOILERS: the answers to some of the earlier puzzles are included in the thread): https://twitter.com/ambivalentricky/status/1506793742128328705

And on Sunday, April 3 be on the lookout for a Universal puzzle by me in those papers that carry the Universal 15x Sunday puzzle, as well as online, where it shouldn't be too tough to find.

Finally, introducing MIDI CONTROLLER, a booklet of 15 midi puzzles for you to print and solve at home (or just solve the included .puz files). 

This month's contest winners will receive both a Lexicon Devil sticker and a print copy of MIDI CONTROLLER.

.puz / PDF