The distance between the highest point of a fret and the strings. Different styles if playing may require different actions. Metal/shred will have lower ones while rock/blues will have higher ones. But a typical set up (measured from the top of the 17th fret to the bottom of each string) is around 4/64 if an inch.
fretbuzz is my assumption, you can get it on one fret or more than one, so raise the action (String elevation) and if it doesn't go away you have to bring it to a guitar shop as uneven or worn down frets really change the sound of the guitar. adjusting the action you will have to adjust the trussrod afterwards though , keep in mind.
Yes, the bridge of a guitar can alter the sound. If you change anything on a guitar it can change the overall tone of the sound it produces.
with a capo
It could be rust? Either way, you will want to change the strings. Sometimes the people at the guitar stores can change them for you if you dont know how.
Action refers to the height of the guitar strings from the fretboard. For High action the strings are farther away making it harder to press the strings down. Low action is the opposite.
take off all the old ones and than put new ones on, you may have to adjust the action and neck on the guitar depending on how drastic the string gauge swap is. but 90% of the time I find you dont have to do anything but change the action.
You can improve the sound quality of your guitar by upgrading the strings, adjusting the action and intonation, upgrading the pickups, and adding a quality preamp or amplifier.
The guitar action at the 12th fret is too high.
In guitar terminology, "action" refers to the height of the strings above the fretboard.
The symptoms of a broken truss rod in a guitar may include a noticeable change in the guitar's neck curvature, difficulty in adjusting the neck relief, buzzing or fretting out of notes, and uneven string action.
Practice
Is the height of the strings on your guitar too high?
fretbuzz is my assumption, you can get it on one fret or more than one, so raise the action (String elevation) and if it doesn't go away you have to bring it to a guitar shop as uneven or worn down frets really change the sound of the guitar. adjusting the action you will have to adjust the trussrod afterwards though , keep in mind.
It can, but only fitting 5 strings to a neck designed for 6 will change the stresses on the neck and might cause the action and intonation to go out, possibly even damaging the guitar.
Yes, tightening the truss rod can lower the action of a guitar by straightening the neck, which can reduce the distance between the strings and the fretboard, resulting in lower action.
guitar hero - no change.
take it to a guitar shop