Different audio functions use separate volume controls:
• Can't hear your baby clearly?
Increase the monitor speaker volume using the Volume + button on the top of the monitor.
• Baby can't hear you clearly during Two-Way Talk?
Increase the camera speaker volume:
Monitor: Menu → Camera → Camera Volume
App: Camera View → Settings → Audio Settings
• Lullaby volume too low?
Increase the lullaby playback volume:
Monitor: Menu → Music → Playback Volume
App: Camera View → Lullaby → Volume