Check Out My New Mini MIDI Controller Prototype – Any Tips on Design or Control Ideas?

My latest WIP, the "World's Second Smallest MIDI Controller" (I think). It's a bit bigger than the first iteration https://www.youtube.com/watch?v=5Ws_JfCw5NY in order to accommodate a potentiometer and larger buttons, as well as a CR2032 battery instead of a CR2016. I also added an ICSP header pinout with the extra room, which is an absolute treat to flash versus using a chip clip, at least in my initial LED flashing test. Also used some better solder paste and possibly heated it to a better temperature and things seemed to melt into place MUCH better.

Cool making a 2nd prototype of something and getting to correct some of your errors! If any of you are musically inclined (or even if you're not) any suggestions on how to actually use it controls-wise? I have some ideas, but good to get other perspectives!
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YouTubeCooked Audio
How I made a the world's smallest MIDI music controller in the form of a 1 inch cube!

ToC:
0:00 - Intro
0:31 - Mechanical Design With Fusion 360
1:06 - KiCad Electrical Design
2:20 - PCB assembly
3:52 - Mechanical assembly
5:25 - Fits into a 1 inch cube and tested!
6:06 - Arduino Code
7:58 - Demo
9:21 - Outro
9:43 - World's first MIDI necklace?...
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