If you cannot hear any audio please check the following settings:
■ Device Settings
・Check to see if your device is set to silent or audio is muted.
・Check to see if your volume is set too low.
・Check to see if your device is connected to earbuds or headphones.
Notes:
・When you change your device's volume and it says "Headphone" or you see a headphone icon, then it's possible your device is connected to earbuds or headphones. Disconnecting your earbuds or headphones might fix your problem.
・Please check with your device's manufacturer for more information on device settings.
■ Game Settings
・Is the Master Volume in Settings set to Min?
・Is the musical note icon next to Music in Settings yellow?
If that does not solve the problem, try restarting the Mario Kart Tour game.
Notes:
・Take care not to accidentally delete the Mario Kart Tour game by mistake.
・If restarting Mario Kart Tour does not fix your problem, try restarting your device.