I just spoke with Bob the other day regarding this very topic. I don’t think he would mind me saying that he was very open and informative about the ARP program. I PM’d him from here with an introduction and contact info. He got back to me within a couple of days. Hope that helps.
Bob may be able to answer this as I believe he has the protocols, but my understanding is that part of the licensing fee for the ARP includes the use of the protocols.
The original marketing literature has some useful information. This was when the units were marketed as Therastim. Not sure of availability.
There are many different types of EMS, TENS and Microstim units available but I have not personally seen any programs like ARP/Therastim. Over to Bob or others.