The 900s had a solid body with a semi hollow acoustic style facade sound hole, maple neck, and rosewood fingerboard was adorned with diamond shaped mother of pearl inlay instead of the cross design the 700s had, it also had an abalone inlay "V" at the 12th fret.
The most publicly recognized Variax Acoustic 900 was used by recording artist James Taylor, while singing the American National Anthem at the opening ceremony of the NBA Finals of 2008, as well as an event hosted at Borders Bookstore.
Variax guitars have a Variax Digital Interface (VDI) port that connects them via an Ethernet cable to compatible hardware like the Line 6 POD amp modelers, or through the Workbench interface via USB to a computer.
Note that the (300-700) guitar cannot be connected directly to the computer but requires a Line 6 USB interface or POD Live / Vetta.
Workbench is also the name of the software that lets users customize the electronic models—change body type, change and move pickups, and adjust volume and tone knobs function.