A simulated feed streams into a Lightweight Charts candlestick chart with
a volume pane. Every tick revises the forming candle with
series.update(); every fifth tick opens a new one. MAIDR
follows the chart on its own: press M inside the price pane to
turn on monitor mode, and each new candle is sonified and
announced while you keep your place. Ctrl/Cmd +
Right Arrow jumps to the newest candle.