The option 'undo' doesn't work as it should with my keyboard (Roland D50).
When pressing this key in a melodic dictation the last note I entered is deleted - just as it should be. However, when releasing the key another note is deleted.
When entering an answer I sometimes press a key before releasing the last one. In this case the undo key deletes both tones at once.
So, by pressing the undo-key once I am deleting not only the last tone -the one I want to delete- but the one before as well or sometimes even everything.
In EarMaster 4 it worked fine (with the same keyboard).