Keyrite key change to microstudio

[karaokekid]

I am attempting to make a CDG disk ,with key changes, to sing at different local functions. I am taking a kma song, changing the key and then saving the renamed song back to the same folder in Microstudio. I then refresh Microstudio, and the changed version is now showing in the list of songs. I then add it to the write list and try to write a disc. I always get the same message with these key changed songs of "Invalid Music File" and it ejects the disc. I can always make a CDG disk with any of the original unaltered files but I want to have one that will not involve a key change in any other player. Any Suggestions?