I just acquired an Aria Pro II Avante Series 6 string fretless in a trade, and was curious about its history. This one has a unlined rosewood fingerboard and single-coil type pickups, in addition to black and chrome stacked knobs and what appears to be an ash body. I noticed that other versions of this bass have ebony boards and soapbar pickups, as well as all-black knobs. Was this bass always a Steve Bailey signature? How did it evolve over time? I heard that a batch of these were US made, and others were Korean. Any extra info on these basses would be greatly appreciated. Thanks!