Demo scene sounds from freesound.org:

https://freesound.org/people/LittleRobotSoundFactory/sounds/270404/
https://freesound.org/people/RICHERlandTV/sounds/216089/
https://freesound.org/people/fins/sounds/191589/
https://freesound.org/people/Srehpog/sounds/31622/
https://freesound.org/people/Natty23/sounds/349182/