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Museum of the Game® & International Arcade Museum® Forums
Made small kid with help of @KazooBR and @Jamesv833 to add volume control.
Pins M/11 are supposed to be on a two pin pot.
Added a small pot at edge for audio testing. If you have an Ameridart cab with volume already part of the harness you can remove this. But if you want to play in a jamma cab without M/11 hooked to a pot I've got this on the pcb for volume control.