Here is a lady tuning her ukulele with a Korg tuner that she has picked up at her local music shop. Turn on the tuner and you will notice that the lights come on. The green light is going to let you know when the note is in tune and each one of the red colors will let you know which way you are out of tune. The notes on the ukulele are from lowest to highest are, 'A, E, C, G.' When the red light shows on the left side of the green then it is flat so you should tune up. If the red light shows on the right side of the green light then it is sharp and you should tune back. Once all of the notes present green on the tuner then it is ready to play.