It worked a few months ago, and now? No. It opens in other browsers, just not Brave ... I even have cookies enabled, and cleared my cache.

Working fine for me on Win 11:

Brave is up to date
Version 1.42.86 Chromium: 104.0.5112.81 (Official Build) (64-bit)

I can clarify I am getting the same message in Brave, but works in Chrome - Win 10

Works on my Windows 11 as well. Brave 1.42.97.

I only get some errors regarding blocked traffic, and it does not allow auto-play, but after hitting the play button manually, it starts.

I would personally turn on "do not track" under "Cookies and other site data" settings in Brave.

Then our site will not even load analytics or benchmarking scripts, so you avoid those errors.

If you have not tried it, turn off shielding for https://soniccharge.com and see if it works.

Sorry for late reply.
It works, thank you very much, Fredrik