Click on the chart and use the left and right arrow keys to walk the spokes. The sonification pans with the spoke's own angle rather than sweeping left to right: 12 o'clock is centred, 3 o'clock is hard right, 6 o'clock is centred again — so the circle sounds like a circle rather than like a row of bars. Press B for braille, T for text descriptions, and S to toggle sonification.
Highlighting follows the first series' markers, which AnyChart draws as
circles. A radar with several series draws each one's markers with a
different symbol, in a layer of its own, and there is no reliable way to
tell them apart in the rendered SVG — so highlighting is switched off for
the whole chart rather than covering the wrong series. Pass an explicit
selectors entry to bindAnyChart to restore it.