The JAB was developed at the request of John Jennings. Jennings wanted an acoustic bass guitar that sounded like an acoustic bass. Many of the commercially available acoustic basses are tight, and punchy, and bass-y, and often very stringy sounding, but lack the deep, warm, woody tone of an upright bass viol. The charge Jennings gave to David Berkowitz was to create an instrument that was “like the [JB-30] baritone, but bigger.” The result was the JAB acoustic bass guitar–as close as you’ll get to a true acoustic bass