Video output selection is controlled by the OS/browser window placement. Move this browser window to the HDMI/LED output, then launch fullscreen.
Space Freeze / UnfreezeF FullscreenP Start / Stop audioB Flash + Click
Frame
0
Clock
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Audio
Muted
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Audio output
Default
Audio Test
dBFS
L
-∞ dBFS
R
-∞ dBFS
-30-23-18-12-60
Muted · -20 dBFS
Audio output selection: use Select output… in Chrome to authorize a specific speaker/interface. Some browsers expose only the system default output. Chrome may ask for microphone permission to reveal device names; this is a browser privacy rule, not audio input recording by this tool.