To start using Sound Amplifier go to Settings > Accessibility > Sound Amplifier.

Sound Amplifier enhances microphone audio from your Android device using headphones to provide a more comfortable and natural listening experience.

Features
• Carry on conversations in loud environments by boosting quiet sounds.
• Personalise your listening experience by adjusting audio or microphone settings with the simple tuning UI.
• Reduce unwanted or distracting noises.

Permissions Notice
• Phone: Needed to know the phone state to pause Sound Amplifier when there’s an incoming or outgoing call.
• Microphone: Needed for real-time audio processing.