Key Signatures are defined by the accidentals that naturally occur in the Major Scale. When writing sheet music, it would become very cluttered to write a Flat or Sharp in front of every note that needed it, so a standard was set to write them at the beginning of every line or anyplace where the Key Signature changes. Below is a list of Key Signatures.
After adjusting the action and string height, you should adjust the height of the pickups. If the pickups are too close to the strings, the magnetic field can cause undesirable distortion.Another by-product of a pickup being too close to the strings is that it can kill your sustain. The strong magnetic field will pull on the string causing it to stop vibrating prematurely. When checking the distance between the pickup and the string, always do so with the string pushed down at the last fret (the fret closest to the pickup). This is where the string will be the closest to the pickup. This is when you make your measurements and settings. Measure from the top of the pickup to the bottom of the string.
First of all, I would like to say that most acoustic guitars do not have adjustable saddles, the solid bridge is fixed and therefore, if the intonation is out, you may just have to live with it.
The intonation refers to the guitar being in tune with itself. The frets of the guitar have been placed at a specific place depending on the guitar’s scale. A guitar’s scale length (or any fretted instrument) is the distance between the nut (or the open string) and the bridge’s saddle. In order to accurately determine an instrument’s scale length, measure from the front edge of the nut to the center of the 12th fret and double the result. This measurement not only determines where the frets are placed for proper intonation, but also has a profound effect on string tension and tone. I will give you an example: