In a new blog at Guitar World, fretless guitar specialist Ned Evett discusses his craft. He touches on gear (signal path and fretboard materials) and performance:
I apply Indian sarod techniques to fretless guitar, incorporating LEFT-hand nail slides into the mix. I began adapting this technique in 1993 trying to coax more sustain out of a fretless 12-string. When you apply left-hand nail technique (on the plain strings, especially) you get a singing tone as the nail glides along the string; this is helpful on an acoustic instrument where you can’t just crank the distortion to get sustain.
Read the rest and watch a video at GW.