@jamesthomson Got the high pitch version -- imagine a radiator hissing. Not the worst, but damn if it doesn't wear me down when I'm already tired. Audiologist tested me a couple of years ago and swears it doesn't get in the way of hearing things (that's a different damage in R ear), but that's hard to believe. Thanks for posting, James. I may give this a try and see if there's one that works for me.