With just a microcurrent channel of 10 Hz and a second microcurrent channel at 40 Hz, just about all pain can be eliminated in most people in 15 minutes.
It has been known for decades and I have seen it work 100s of times with folks that had no investment mentality in outcome.

The pathway explained simply:
-40Hz -Gamma rhythm:
This particular treatment is proven to increase dopamine and serotonin. It can also improve how the mitochondria in your cells function, making an individual more energetic and enhancing mood. This is because the mitochondria of the cells produce energy.
'Data demonstrated that 40Hz light flicker significantly increased the overall brain oscillation power, particularly in the occipital areas on both sides of the brain' Y.Zhang et Al.
-10Hz -Alpha rhythm:
This frequency is similar to the alpha neural brain waves. Alpha waves are linked to the alpha state of the brain, which promotes learning, mental coordination, and mindfulness. It can induce feelings of calm, increase creativity, and enhance your ability to absorb information.
'Creativity has a brain wave signature as well: alpha waves pulsing out of the brain's right hemisphere' Steven Kotler.

As one often finds with the lost Reddit and Snooope basement dwellers that slither out via Communist Notes they are silly wrong about their guesses and even wrong about the reality of what they guess. And folks ask me why they don’t hear about this stuff. Find these fools and ask them why.

There is much more to other aspects of this technology most have never heard of.
Why this is not common everyplace, because is works?
Here is one moment decades ago other frequencies cured Pete Townsend: