The O Port in Gibson Acoustic Posted September 25, 2010 · Report reply Smoke and steam oozes from the laboratory. The test brings up a series of facets. A more open and spread tone seem to be gained on the cost of dynamics f.x. Is this a logic we recognize from certain scalloped bracings. By now it sounds as if the device could be used once in a while to change the vibe around ones guitar. Something different happens when the ring is in. Other moods, unknown reactions to old routines – maybe new paths ahead for writing.