Capcom CPS-2: Super Capacitor
If you are having audio issues with your Capcom CPS-2 board or multi kit, then this just might be the component to fix it.
High quality Eaton brand "supercap" to suit CPS-2 motherboards.
Replacing this super capacitor is known to fix:
Volume levels not saving after powering down
Volume being silent or at maximum on boot
Non-responsive volume controls, etc.
NOTE: We can not guarantee this will solve your audio issues, but it's well documented that replacing this particular component has fixed many CPS-2 boards with audio issues.
You will need to have the ability to desolder and re-solder to swap out this component on your motherboard.