Prewired for jamma stereo help plz

I have a jamma showcase cab. it is prewired for stereo sound, when using any jamma neo geo boards... mv-1c, mv-1f, etc..i can get picture and control fine, but not sound ? how can i change this to get sound working ? anyone have an adaptor ? or how to rewire for just normal sound ?

I am guessing that it has an amp.....

Bypass it.

my mv-1f has pins on the pcb for stereo sound. So use the jamma port for all non sound stuff. And for the sound use the pins on the left side of the pcb. I took a power plug for a 3 1/2 inch floppy drive off of a 286 power supply and carefuly hammered it into the stereo sound pins on my board and it fits nicely. Some MVS systems have stereo sound on the jamma pins and others don't. Here's a list of which ones have stereo sound and where to get the stereo sound from

http://www.hardmvs.com/html/PCBcompare.htm