Isn't the connector on the back on an SB live just a gameport? Didn't they strip out the midi support?
I could be thinking of a different sound card though...
I don't know if you can strip out MIDI support from a PC sound card because some of the later (pre-usb) joysticks actually use the MIDI protocol to communicate with the joystick. For example the Sidewinder FF.
It was actually very clever because to read pc joystick you hard to time the discharge rate of a capacitor (repeatedly) which is really expensive as far as CPU...