 A number of luthiers are now incorporating a soundport, an additional small soundhole on the guitar's side, usually facing the player.This is said to allow air to move more freely in and out of the body of the guitar as it is vibrating, and to have the advantage of allowing the player to better hear the sound projecting from the guitar.The only published formal research on the latter subject suggests however that players may not be able to hear any difference in a soundport equipped guitar.