Thanks for the comment/question! I started estim exploration about 20+ years ago now, using homemade stereostim equipement (It’s relatively easy…) and then about a year ago I upgraded to the E312B that you have. Love the machine.
I use a tri-phase set-up - One ring around the head of my cock, another around the base of my cock and balls, and the common ground is a bi-polar inserted anal plug, that rests on my prostate!
Will try to post some pics and or movies of me playing… like this one-