It's a guitar with some interesting features over-and-above the fact that it's fretless. For example, the body, headstock, and control plates are all engraved (I don't own a CNC machine, so this was all my own work).
For an S-style guitar, it has a 4-way selector switch rather than a 5-way; couple this with a mini-switch that adds the middle pickup to whatever the main switch has selected, and you have 8 switchable tones.
It is a one-off custom creation
4-way switch wired Bridge - Bridge+Neck (parallel) - Bridge+Neck (Series) - Neck
The mini switch adds the middle pickup to whatever the main 4-way switch has selected, thus giving a total of 8 switchable sounds
Control cavities and plates both shielded and grounded