For live sound and for people who don't have too much hearing loss, the hearing aid doesn't have to reproduce all the sound. Instead it supplements what's already there. Some of the sound goes through a vent directly to your ear. A hearing aid doesn't have to reproduce deep bass notes, for example.
And for a lot of live music, it's plenty loud enough and protection from (further) hearing loss would be more of an issue.
The main issue I have with my hearing aid when playing music is that the feedback cancelation isn't as good as I'd like for pure, higher pitched notes. (Feedback protection is needed because sound goes out the vent as well as in and that reaches the microphone.)
And for a lot of live music, it's plenty loud enough and protection from (further) hearing loss would be more of an issue.
The main issue I have with my hearing aid when playing music is that the feedback cancelation isn't as good as I'd like for pure, higher pitched notes. (Feedback protection is needed because sound goes out the vent as well as in and that reaches the microphone.)