I have Music Maker Premium edition 2017 in windows 10. I can not add clues (or tracks), I only have the default 8. The PDF manual says that below the fixer there is a button for it but it does not exist, and it does not work either using the shortcut "Ctrl + I How can I add more tracks?
You forgot to unlock the function in the store using your free coupons which were included in the premium version. Same goes also for the presets, instruments, soundpools. Does also need to be unlocked. A tutorial can be found here