I've run into the same problem when trying to convert styles to the kn6k. People will take the short route and use custom memories and that makes all the tempos the same. I always copy the file into the composer and work on them there. Much more control and the tempo stays true. It can be a real hassle trying to figure out what the proper tempo should be, other than 120. Using the custom memory is fine if you also include the true tempos in a text file.