This reminds me of some good stuff and some fringe pseudo-science as well.
The "Zapper" uses higher frequencies from a signal generator while you hold the copper electrodes (moist, and in each hand). That also uses a square wave.
I'd expect that (IF there is true value in these things) that the frequencies would vary slightly for each of us.
Sound and vibration do have a positive effect for me and i always get the ultrasonic ~1Mhz treatment from my Osteo.
As far as de-calcification goes, i'd be wary about what is newly laid calcium and what is bone. I'm sure it could help scar tissue and stiffness. Probably helps to get the sonic treatment during prone lying too.
Keep us informed how you go - i'm sure we've all done the stretches and marks for our rheumies and physios...

Ted

There’s nothing
- absolutely nothing - half so much worth doing as messing around in boats.
Ratty, Wind in the Willows