Upgrade - Side Sound Port

The side sound Port is a second sound hole in the top of the guitar. It helps get the sound from the strings more directly to your ear. A lot of times when people are playing in noisy environments or playing nuanced songs they don't sound quite right because the sound has farther to travel and bounce before it makes it back to your ear. It does reduce the sound out the front of the instrument a bit because it increases the avenues for the pressure in the soundbox to escape.