Do you have a gate valve or ball valve. I'm assuming you have a ball valve. Somehow I lucked out with my first tank with a Herbie and was able to tune with the ball valve.
Current build I needed to get a gate valve to make smaller adjustments.
You could also try not running your emergency straight down so the water doesn't have do far to fall which is most likely where your sound is coming from.
Can you post a picture of all your plumbing and maybe a short video may help to get a better picture of what you're dealing with.
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