It’s a classic technology dodge, isn’t it? Put something in there that the product needs to actually improve gain before feedback, hand it over to marketing who turn it into a win/win
Have you ever used a megaphone and wondered why your voice sounds different through it? It’s because the device uses a frequency/phase shift to reduce the incidence of feedback. It’s the same with the soundrecover to some extent - the difference is that somebody also realised that there is a practical aspect to frequency compression in terms of precipitous losses. I’ll be generous and say it was down to an Engineering/Audiology inspiration rather than marketing…
When you get your REM kit, plot a curve with the soundrecover at either end of the slider, look at the difference in the HF gain. IMHO it’s also a bit like the ESP/traction control on a Merc: you turn it off, but it’s still ‘managed’ to some extent.
The real ear measurement system that E.D. might purchase at some time in the future will be able to illustrate the actual HF gain in operation - with properly fitted aids, it’s quite possible to demonstrate how effective the aid is in providing dynamic response to speech input - even for the seriously steep losses. If the Soundrecover is off completely, a 4Khz pitch will be reproduced at 4Khz (as in any other aid). If it’s on a fraction (Mercedes) it may be 3.7Khz. If the slider is set fully over it might be 3KHz.
HTH