Tinkerers will find a lot to tweak on Elyra Guitars' Fox Elyra semi-hollowbody. The neck runs the length of the body, and the guitar top, pickups, bridge, and controls are all attached to the block in an effort to increase sustain. Tone discs of different materials attach beneath this center section, purportedly to impart varying tonal characteristics, and that entire assembly fits inside the lyre-shaped back and sides.