The main thing is which tone sounds best to you, then you can basically choose it, just like the China Voice audition; generally speaking, you will be given the same piece of music in two Once you play on the piano and listen carefully, you will definitely be able to hear the difference. It would be better if you or your children can play it. If you are afraid that you can't hear it, I will take two more videos and compare them slowly when you get home. It’s almost enough to compare the configuration and process details.