OK, yeah, I’d say to try to turn the Feedback Management to LOW or OFF to see if it goes away or not. You have severe to profound hearing loss already at 500 Hz for your right ear and 1 KHz for your left ear, so your amplification must be very strong and you’re probably very prone to feedbacks in many situations. So if turning the Feedback Management to OFF causes a lot of feedback issues for you, maybe try LOW as a compromise so that you get some help with feedback, and less of the warbling caused by the Feedback Management, although still have some warbling but as a compromise, live with it.
But do note that this Feedback Management technology shown here is the new Oticon proprietary Sound Optimizer feedback “prevention” (proactive instead of reactive approach) technology that only got introduced in the previous generation (the OPN S before the More). This new technology watches out of “potential” but non-existing feedback risks that can build up, and stave it off in advance by introducing quick short bursts of sound to break off this feedback energy build-up. So the warbling some people can hear is these bursts of break sounds inserted to break up the feedback energy build-up.
So if you can’t make use of it and must turn it OFF completely (which is a shame), don’t forget that you still have the older traditional Feedback Analyzer and suppression technology that exists before the OPN S (in the OPN and before that) that you can still resort to. See the screenshot below where you can activate it. Basically your HCP would run the Feedback Analyzer test that would introduce white noise into your hearing aids throughout the frequency range so the tool would see where feedback can occur in the frequency range. Then amplification can be dampened at those feedback frequency points to help suppress feedback before it happens. There is also a 10 Hz frequency shift, as well as a phase shift, all 3 of which are the 3 main strategies in suppressing feedback the traditional way. The 10 Hz frequency shift may cause you to hear some warbling when there’s a pure tone being heard, because the delayed sound by 10 Hz may be heard together with the original sound, causing cancellation windows that result in warbling. But that’s mostly on continuous pure tone situations and usually it’s not a problem for normal sounds like speech and noise. Usually it may be more noticeable for music.
Anyway, to summarize, try to live with the LOW setting on the Feedback Management (the new feedback prevention technology) if you can because it’s a very effective technology and your hearing loss can be very prone to feedbacks. However, if LOW is still very annoying to you, then your HCP can turn it OFF and enable the traditional Feedback Analyzer/Management for you. The drawback of the older reactive technology is that you will have amplification suppression/limit at potential feedback spots, which will be applied when feedback happens. This will lower the amplification margin you can have, so you will not be able to hear as clearly when the feedback is being suppressed because amplification is limited.
The second screenshot below is an example of the feedback suppression which causes amplification loss of margin. The shaded areas on the top is where the Feedback Analyzer detects feedback when running the white noise test, so Genie 2 specifies the shaded area as where the amplification needs to be suppressed to avoid feedback. As a result, the actual gain curve is suppressed to be below the Target gain curve. There’s not much you can do about it because that’s the price to pay to control feedback in the old reactive way. The advantage of the new proactive way in the MoreSound Optimizer feedback prevention technology is that you don’t lose as much amplification margin reserved for feedback control, and this allows you to have better signal to noise ratio for your amplification, thereby allowing you to hear louder and more clearly over noise because the amplification can be set to its full potential.
