I can't say anything about the multi-cart since I haven't used one before, but being that you have a 1 slot, it seems like a good way to go. The Neo Geo system used a modified JAMMA wiring that requires you to use a "Neo Geo JAMMA" to regular JAMMA adapter. This generally applies to 2 slot, 4 slot, or 6 slot machines and has to do with how they wired stereo sound right into the JAMMA harness. Some 1 slot boards used the regular JAMMA with mono sound so it's possible yours won't need anything if you do want to play other JAMMA boards in the cabinet. Is it a conversion or a dedicated? I would think SNK used stereo on any of the dedicated cabinets, but I'm not sure on the 1 slot.