There are three variables that make a string sound different;
When you tune, you are changing the tension of a string to matching the pitch of one string to another. In this method of tuning you are finding the same sounding note on the thicker string and comparing it to an open note on the thinner string below.
- IMAGE 1: This diagram shows all the notes up to the 5th fret on all strings. As you can see all strings except the "G" repeat the note on the following string on the 5th fret. This means that if you can find the same note on another strings then you have another note to reference your tuning note with. Providing your starting note is correct all other strings will tune in properly.
- IMAGE 2: This diagram shows how the "A" note on the 6th string is the same a the "A" 5th string open. If you sound both these note together you will hear they sound the same. Remember to play on the tip of your finger so you don't mute out the 5th string when pushing down on the 6th. If both these notes don't sound the same then your guitar is out of tune.
- IMAGE 3, 4 & END: These strings are also tuned the same, 5th fret on the thicker string and open note played directly underneath it.
- IMAGE 5: This is the only string that is tuned by the 4th and open. This is because "B" is found on the 4th fret on the 3rd string.