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SOUND SETTINGS:
To Use with Microphone
System Preferences - Sound:
Input = JBL Quantum 400 Chat - USB
Output = JBL Quantum 400 Game - USB

SOUND SETTINGS:
To Use with Microphone
System Preferences - Sound:
Input = Movavi Sound Grabber
Output = Headphones

Movavi Capture Screen Settings:
System Audio = Selected
Built-in Mic = Selected

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To Use without Microphone
System Preferences - Sound:
Input = Internal Microphone
Output = Internal Speakers

Movavi Capture Screen Settings:
System Audio = Selected
Built-in Mic = Selected

SOUND SETTINGS:
To Use with Microphone
System Preferences - Sound:
Input = External Microphone (Built-in) 
Output = Headphones

*******

To Use without Microphone
System Preferences - Sound:
Input = Internal Microphone (Built-in)
Output = Internal Speakers (Built-in)