MD+ & MSU-MD
The MegaSD supports adding CD audio to existing Genesis / Mega Drive roms using special patches. There are multiple formats out there to do this. TerraOnion created the MD+ format which currently only works on the MegaSD cartridge. it allows for seamless looping and fade-in/fade-out effects. There is an older format, Mode 0, that similarly allows CD audio to be added to games but it doesn't have all of the advanced features of MD+. MSU-MD, the format that is supported by the Everdrive Pro, is based on this format. The benefit to Mode 1 / MSU-MD is that it allows you to burn a CD and use the enhanced audio with real Sega CD / Mega CD hardware.
The MD+ documentation manual can be found <insert link here>
List of MD+ games and links:
Afterburner II Art of Fighting Castle of Illusion Chiki Chiki Boys Comix Zone Darius II Ghouls 'n Ghosts Golden Axe M.U.S.H.A Moonwalker The New Zealand Story OutRun Raiden Trad Revenge of Shinobi Rocket Knight Adventures Streets of Rage Streets of Rage 2 Strider Sunset Riders TMNT: The Hyperstone Heist Xeno Crisis Ys III: Wanderers from Ys
List of compatible, unique MSU-MD games and links: