Weird Sound Issue

[Eddiie]

I did some searching before posting this... haah

I have a blade.

Sound is fine with every game except -
Elton John
Elvis Shake
Johnny Cash

The door noise works.

There is no reel sound, credit count up sound, nothing.

What I've done to try to fix -
I made a BB1/BB2  analog cable that goes from the back plane to the audio amp, I even plugged in some USB powered speakers.
The result of this is the same as the digital audio..  Door noise works.   That's it.

I've tried different CPUs...  Same, no sound.

Load different games, sound is fine.

These games are played on BB3 Blade upright cabinets, I've seen them!  haha

What am I missing here?

There's 2 unused pins on the audio connector, .......  that goes to the backplane,  maybe that is it.

I picked up a chair amp, but need a wiring diagram with pinouts.

Any help is appreciated.

[Stayouttadabunker]

Sounds like a bad CF GAME card.

[rickhunter]

Try a newer OS card. I've had games with missing sounds with earlier OS cards, notably OMG Kittens.  It might be the same issue with you.

[Eddiie]

I tried a newer OS , 4076, but it did not resolve the sound issue.
I am going to try a chair amp, but need a hook up diagram