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Please move your cursor over the strings, one at a time, on the neck of the guitar banner above, to hear the notes of the open strings (remember your bottom E is the ‘top’ string in the banner). Tune your guitar string to the sound you hear, for the appropriate string you are tuning.

When your guitar is fully tuned check your guitar sounds like the full open strum you hear when you have moved your cursor over the strings between the neck pickup and the bridge pickup.

NB: To hear the individual notes (or the full strum) play for their actual time, you need to leave the cursor on the relevant string area for a few seconds. ie between the neck pickup and the bridge pickup for the full strum and on the appropriate string on the neck for individual string sounds.
A quick reference chart