This add-on replaces the standard NVDA synth tones with a base tone from a wav audio file, allowing for a much more pleasant experience with things like progress bars and other scenarios where NVDA uses tones to communicate what's happening on the system. This is the first version of this addon, and this is also a side project I had the idea of making for a while, so stay tuned for more to come from this in the future.
If you want to help make the add-on better, feel free to send in pull requests.