You are making a TOTALLY WRONG assumption that we’re talking about frequency compression here, because we are NOT. We are ONLY talking about GAIN compression here.
Of course nobody would want to use frequency compression for music. And frequency compression can be completely disabled with a turn of a software switch, so it’s not even an issue here to begin with.
You’re also jumping into conclusion to state that because Oticon doesn’t let you directly set GAIN compression ratios to zero at each frequency band that it is not suitable for musician. Most built-in music programs in most aids are likely to minimize GAIN compression as much as they can (in addition to turning off a lot of the other digital processing functionalities), but I doubt that any hearing aid brand will let you DIRECTLY set the GAIN compression ratio. If you can find one HA brand that allows you to change GAIN compression ratio directly, please let me know.
Here’s is a link on this forum on how to turn off GAIN compression on Widex HAs → it seems like it simply has the same setup as the Oticon Genie 2 software does → you can change the GAIN compression ratio to 1 by setting the gain value between Soft, Medium and Loud gain levels to be exactly the same. But then the gain curves you end up getting will either make you not be able to hear the soft sounds anymore, or if you set the gain to be able to hear the soft sounds, then the loud sounds will be WAY too loud for your hearing comfort.

One of the more frustrating things I’m seeing with Widex Moment Sheer 440s, specifically when working on music through studio monitors, is there doesn’t seem to be a way to shut the compression OFF (or any of the fancy, revolving AI detection stuff). Did the earlier models allow for this? Anyone have any success self programming Widex for music listening? I love the concept of the zero delay Puresound mode, but NOT the revolving AI that appears to be a necessary inclusion.
Please find an HA brand that will allow people with hearing loss (not just mild hearing loss, but moderate to severe to profound, like yours) to set the GAIN compression directly and set them all to a 1 value, then listen to the end result. Then if you are satisfied with it like you think you will be, come back here and share with us what HA brand it is that lets you do that, and confirm and show that you actually have GAIN compression of 1.0 across the board on all frequency bands, and that you actually absolutely love it. I’d love to hear from musician folks with moderate/severe/profound hearing losses set their GAIN compression to 1 across the board and find that they’re totally happy with it.