I think it's perfectly possible to solve a problem in a forum as has been proved a million times in the past. If multiple panel memories require multiple composers, then because there are more panel memories than composers you need to store different composers in the custom section. Thus load the different composers and copy to custom slots 1 to 20. Then load the prepared multiple panel memories and select each and resave pointing to the matching rhythm in the custom section slot instead of the composer. Then save panel memories PLUS all custom on page 2 save.