The manual that includes all the dip switch settings and the list of compatible games (the one where you have to click the link to obtain...not the Word Document that is zipped as an attachment), which I will call MAN1, says that it is very important that you have the -5v connected...

It is reflected in the pinout, which I will call MANPIN1, that it provides as well...

The Word Document manual, which I will call MAN2, has no such warning about the -5v as seen here...

And it is reflected in the pinout, which I will call MANPIN2, it provides as well...

Another part to consider (or not, I don't know so I will put it out there), is that the JAMMA pinout shows the -5v being hooked up to both the Component Side as well as the Solder Side as seen below...

MAN1 and MANPIN1 show the -5v only hooked up to the Part Side of the harness. So I put it out there for thoughts on this matter...-5v on just one side would mean that I need to cut the pin on the Component Side of my MGCD harness if I go with MAN1's instructions? Leave both -5v connected on the MGCD harness because I should be looking somewhere else? Does the MGCD require an amp for stereo sound or should I be able to get sound straight from the JAMMA loom in my Dynamo HS-5 cab?
I've got the controls and video all up and running, but I have no sound at all. I have tried turning up the cab's volume as well as turning up the orange pot on the MGCD board. I'm a little lost and any help would be much appreciated. Thank you.