Tuning Method Four
Use a tuning fork as (shown in the video later on), or other device such as a keyboard or pitch pipe etc.. to get one note
The idea is the tuning fork gives a note that you match one of the strings to, then you tune the other strings from that string
Study the video shown later on as this is shown in it
The diagrams here show how to match the other strings once you have got one string tuned
In the video the tuning forked used gives the Note of A so the first string tuned is the 2nd Bass string the A String
NOTE
It can be very confusing at first using a tuning fork, as the actual note of A you hear is a different pitch than what the A Bass string should sound like. It is several Octaves higher in pitch than the Bass string