electricguitarhit.ogg is modified from a file made by guitarguy1985 at https://freesound.org/people/guitarguy1985/sounds/52391/ which is licensed under the Creative Commons 0 License. This modified file follows the same license.
universal.ogg is modified from free sound effects from https://www.fesliyanstudios.com which are licensed under the CC0 1.0 License. This modified file follows the same license.
