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If you have an arcade machine that isn't putting out any or clear sound or you have an arcade pcb or game that has partial sound, crackeling sound, only sound effects and no music or any other sound related problems, this tip might help you fix that problem. First things first, check, re-check, and tripple check that the -5v line is hooked up to the JAMMA harness correctly and/or hooked up. For a lot of the arcade boards/pcb's the -5v is an essential part of the sound and without it being connected or being connected to another part on the board you will most likely experience all of the above sound trouble when you hook up an arcade game. This is meant as a trouble shooting tip to help you reduce or eliminate sound issues you may be having with your arcade machine and boards and get you back on track to enjoying the games you love to play