Donymak/HearingLossSimulator ? reverse-engineered prompt

Build me a simple web app that lets people hear what sounds are like with different kinds of hearing loss.

It should have a sound picker with a play button, a few preset hearing profiles like normal, mild, moderate, and severe, and a custom mode where I can adjust hearing loss for different frequencies from 125 Hz to 8000 Hz. I’d also like separate controls for each ear, or a way to average them together.

Add a background sound option and a balance slider so users can mix the main sound with the noise and understand how hard it is to focus on speech. As the custom settings change, show a live audiogram chart so the hearing loss is easy to see.

Make it clean, responsive, and easy to use on a phone or desktop. If you need to look up anything current for browser audio handling, feel free to do that.