In this photo, Greg Edwards can be seen with a Wal Fretless Bass. In a [Premier Guitar interview] (http://www.premierguitar.com/articles/22683-failures-monster-comeback?page=3), Edwards stated, "I bought one because Mick Karn played them in the band Japan. When I saw the crazy and unique way he played that instrument, I was completely in awe. So in a way, he’s really the first person who brought attention to them."more
Wal made fretless basses for each of the MK models. This photo shows from left to right, MK 3, MK 2, and MK 1. There is very little difference in tonal qualities for the Wal basses. They all feature the same circuitry that gives them their signature growl. The differences actually lay in the appearances between the MK 1, 2, and 3 bodies.
The MK 1 features short, stubby horns and a flat back end. They closely resemble a Fender Precision bass that has been squished bridge to neck.
The MK 2 features a much longer top horn but is generally the same shape as a 1.
The MK 3 features the longer horn of the MK 2 but also adds in a slanted back end behind the bridge, running from the strap peg inward and upward towards the players chest.