If you cannot hear audio while playing animations or pronunciations in the app, the system sounds may be muted.
System sounds can be muted and controlled in two ways, via the side switch, or in the control center.
Side Switch
- Check the side switch to see if your device is muted (orange).
- If it is, turning it off will resume sounds.
- Use the volume buttons on the side to raise the volume of your device.
Control Center
- Swipe up from the bottom of the screen.
- If the bell icon is red, your sounds are muted. Tap it to unmute your sounds.
- Use the volume buttons on the side to raise the volume of your device.
For more information, check out these articles:
https://support.apple.com/en-us/HT204171
https://support.apple.com/en-us/HT203017#sound
https://support.apple.com/en-us/HT202769