You can record the system audio of a tab while recording your screen.

Please refer to the below steps:
– Click on the StoryXpress extension icon.
– Select ‘This Tab’ recording mode from the drop-down.
– Toggle on the ‘Tab audio’ option.
– Hit ‘Start Recording’.

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Please note:
1. You can record the audio from a particular tab only.

2. If you wish to record or mute your audio while speaking please turn on/off the microphone toggle from the extension accordingly.