NBA Jam has nothing to do with the sound board; the sound comms are TO the board only (the ST-V Batman game uses the same sound board). The ROM mapping/banking is the problem. smf was working on a trojan at one point to figure it out, but lost interest.
Primal Rage 2 there's a fairly scary number of boardsets floating around for a prototype. Probably needs a trojan to determine the proper behavior.
Gallop Racer 2 and Psychic Force EX likely suffer from baseline PSX emulation errors. It's unfortunate none of the non-MAME PSX emulators support the arcade games to help with this diagnosis though.