A range of other sound effects that were not present in Modern Warfare were also used, including unused audio channels that had been created for the original, but due to restraints had not been included during its development.
En rad andra ljudeffekter som inte finns med i originalspelet togs också med, inklusive oanvända ljudkanaler som hade skapats för originalet, men på grund av begränsningar inte hade tagits med under dess utveckling.