Side sound ports have become popular in recent years. The main reason I do this is to open up some of the higher frequencies in the players direction. We’ve all heard what the guitar sounds like out front when It’s being played. But those frequencies are directed out and away from the player. The engineered sound holes on my guitars are a directional port triangulated to be aimed at the players ear in the playing position. I finish them off with a four holed bezel and then a vinyl mesh to complete a modern progressive look and feel.