Let me see if I can explain this...If worst comes to Worst I'll change the Setting in the Candy Cab to Japanese..and help you..
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Go into the Soft Dips..(Press Test Switch)
You have to change cabinet settings to demo sound on withing that.
That would be the third one down.(Setting Up The soft Dip)
The Next Screen with be :......Choose "Setting Up The Cabinet"..First Selection.
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Next Screen :go to the Bottom/select that and change it...It only has two selections ("Without" and Set-Up in Each Game"..So if you change it the sound should work now after restarting the cab or backing out/Exit.....(Back Out press,B until you get back to the first screen choose the bottom choice,"EXIT"..If you can't just turn the cab off and on...the settings should save.
If no sound..
Go back into "Setting up the Cabinet" where the games are listed..And Choose "Demo Sound On" in each game..
I think it's on by default..But where the setting is located in each game varies in the list of changes you can make.
If you need more pics LMK..