Not an Opera user but can confirm the web page is working fine in the latest Chrome and Firefox. I even tried it on our Ancient corporate version of Explorer 6.

PS, I ordered the recommended AIX sampler a while ago as well. It truly is a fun experience, surround sound wise. Definitely, the best go-to source in my pile if you need to explain the concept of soundstage to someone. Also, the artists AIX uses in a lot of their recordings are truly top notch.

With great power comes Awesome irresponsibility.