And now for the almost undocumented and likely very rarely used feature. The games featuring the Squawk & Talk sound board have registers 20 and 21 enabled in the menu. Both registers range from 0 to 15. And these can be made to adjust the sound and speech volume of the sound board, respectively. Instead of the main volume control in the coin door and the individual volume knobs on the board itself. If and when the sound board is jumpered for this. By moving jumper DD to CC and N to M.

The feature is only hinted in the Bally game manuals. And the only other mention of this that I have been able to find is a document on the sound board made a while ago by a Clive Jones. This is referenced in the good old Clay repair guides.

I wonder if anybody has ever configured the volume control this way. Ever ever. It seems like a hazzel to work on compared to just adjusting sound on the knobs. No sound played while in the menu to fine tune after, right. Speculation on this design. During the design of the Squawk & Talk board, the computer controlled volume levels were introduced as a feature for games to change this per game rules / special effects. But this I have likewise never heard of.

I would love to hear reports if this computer controlled volume control was ever prefered and put to use.

BTW. Settings are shifted, so 0 is lowest, 14 is highest and 15 is off. My previous analysis and what I send to Slam Tilt Podcast was not correct.

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It works as-is with factory software for Eight Ball Deluxe. Assume the other S&T games as well.

You may enable/disable sound and speech volume CPU controlled individually. So also both at the same time. But jumpering the board for this will also omit the main volume knob in the coin door.