Hmmm… REM. The provider from whom I bought these aids is 3,000 miles from where I live. The provider from whom I got the replacement receivers is 460 miles – I was traveling last week. She’s a Phonak specialist. She didn’t mention REM.
By coincidence (I think) my unanswered question posted Apr 2015 about REM on the DIY sub-forum was bumped yesterday – DIY REM (Real Ear Measurement)? - #6 by Markismus
I can do some fitting changes on a DIY basis, but for REM I’d be paying a provider a-la-carte. There is a local provider who did an audiogram and re-fitting in January; I guess I could ask for a price quote on REM.