OK -- the modification is very simple --
You just need to buy or build a single-coil guitar pickup.
Here is a diagram:

When I first try Alex ring design, I don't feel anything.
Then, I try Alex's ring while listening to loud, rock music -- I feel something in the fingers!
I thought about it more and more, and realized that the power
of rock and roll starts first from the fingers (strumming guitar), then through a pickup that converts
sound vibration to electrical signal. This pickup must be the key.
Alex's ring is like a tiny pickup -- but to be effective, you need a real pickup.
Try this out and let us know your results.
(I do not wear it all the time since it is bulky. I wear it maybe an hour a day while listening to LOUD ROCK MUSIC! AC/DC, ANDREW WK)