But I understand the Music setting on the Quattro flattens the frequency response that is normally shaped to boost those narrow specific speech bands. I do a bit of music production and that was one of the key features I was hoped the Preza would preserve.
I am not familiar with the Quattro and ReSound practices, but I have the feeling that these higher end hearing aids all do pretty much the same thing. I am most familiar with the KS8 (Rexton Emerald 80, or Signia 7Nx) from Costco, as I have them as well as the Connexx programming software, so I can see what they do and what options they have. I don’t have the hardware to actually program them though.
From what I see in the software is that the hearing aid gain from program to program, including the three music programs on the KS8’s remains the same. The gain vs frequency strategy comes from the prescription formula. Some are more intended for speech than others. The music programs typically only play with the other features such as noise reduction, Peak limiting, and feedback suppression speed. That said there is nothing preventing the fitter from adjusting the gain vs frequency correction for the music specific program. It is kind of a trial and error process though.
Separate from that is the streaming program. The normal programs are essentially for sound picked up by the hearing aid microphones, and what you get in your ear is a combination of the natural sound and the amplified sound. The balance between the two is determined by how open or closed your fitting is. However, when you go pure streaming, there is no natural sound. That most often leaves the ear canal short of bass which comes in through the fitting. So it is normal to have a streaming equalizer that can adjust the sound in up to 20 bands to correct for the loss of normal ambient sound. This equalization is applied on top of the equalization used in the normal programs.
The other thing you might find of interest is the anti reverb program. It is intended to null out echos that make it hard to understand speech in auditoriums with hard sound reflection surfaces.
Hope that helps more than it confuses…