Turn it too high or too low. Key selection 1G means that when a song is played and sung, the pitch and chords are exactly the same as the original music, or a completely different key, and the chord fingers used are exactly the same. To simply understand, the original key 1G is the original pitch of a piece of music. Choosing the key 1G is a key that is too high or too low, making it difficult to sing. Choose 1G to sing.