I have had the Loneoceans midi2 controller for a while, just never got around to put it together, so now I finally have it boxed up, you can see how that was done here: https://highvoltageforum.net/index.php?topic=114.0
If you want your own MIDI controller, you can buy it here: http://loneoceans.com/labs/sales/midi2/.
Here are 4 videos I recorded while testing the MIDI functionality of the controller. They were all played back on the Kaizer DRSSTC II which is a mini coil resonating at ~300 kHz, so it will have a preference for high notes and not so much for the bass.
The Imperial March
Dance of the Sugar Plum Fairy
Scooter – Friends