You have to go to the game options menu that's controlled by the service button that's located on the inside of the coin door. Option #18 is the sound setting and has four different settings which is 00,01,02, and 03. The setting for the best sounds is setting #03. The start button is used to change the settings. Changing the sound setting will only hold permanently if your MPU has a working battery for the memory backup. If the battery is dead, then any changes made in the game option menu will be lost once the machine is turn off.

@@727PENGO Thank you so much it sounds so much better

Kings of Steel and Black Pyramid both ran off of the same system. For the sounds they both used Bally's Cheap Squeak Sound Board.

Spy Hunter and Cybernaut both came out around the time of those two machines and used the same sound board.