Speaking Mode
Lock Sentence for Repeated Listening
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Enable Speaking Mode from the Settings page.
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Choose whether to lock the primary or secondary subtitle.
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Click on a subtitle line. A dashed border will appear to indicate it is locked.

Recording (Hold)
Hold Alt + R to record; release to auto-play.
Microphone Monitoring
Press Alt + M to enable microphone monitoring to hear your voice in real-time.
Press it again to disable monitoring.
Recording and microphone monitoring can be used without locking a sentence.