Abstract: A method and apparatus for providing a wave-table upgrade card to a baseboard having integrated audio card capabilities. The baseboard with the integrated audio features is provided with a connector with a predetermined header that is adapted to be coupled to a wave-table upgrade card through a plurality of data conductors. The wave-table upgrade card is provided with a connector having the same predetermined header as the connector on the baseboard. The predetermined header for the connectors and the data conductors includes a MIDI.sub.-- Out pin, a Wave.sub.-- Right pin, a Wave.sub.-- Left pin, a MIDI.sub.-- In pin, at least one ground pin, and a physical key that prevents improper insertion of the data conductors into the connectors on the wave-table card and baseboard.