hmm looks like you don't need me anymore. well for those who want to know more info...
essentially the what you're trying to do is to swap discs without the mini-disc player knowing you ejected the tape. for a 722, you start with taking out the batteries, covering the little switch that tells the md player when a tape is inside. if there's a disc inside the switch is pressed on by the disc. when you eject, the disc comes out and the switch shoots up because the disc is no longer on top of the switch. by covering the switch with tape or something, the md player will never always think there's a tape inside. after convering the switch. put in a disc with no disc space left, ie it's full. (make sure both the tape you're cloning and the disc to be cloned are the same length. important). put in batteries. start up the player. give the disc a new name to dirty up the TOC and eject the disc. put in the disc with the faulty TOC and shut down the MD player and let it edit the TOC. if all goes well you can now see what's on the disc.