I recently bought a fretless (Ibanez SRH500F), and I'm curious about how other fretless players achieve accurate intonation when the length and spacing of our fingers aren't equal. Do you do finger stretching exercises to increase the spacing between your fingers? Do you simply shift your hand slightly to get the shorter/tighter spacing finger to hit the correct spot? I find that my ring finger is the problematic one--it doesn't stretch as far naturally so it always naturally lands on the spot just short of accurate intonation in a 3-fret stretch. I would have to always shift my hand just a little to get the ring finger to hit to right spot. Pinky sometimes has issues if I'm not being vigilante while doing a 4-fret stretch, but most of the time if I'm paying attention it's okay. It boggles my mind that advanced orchestral strings, double bass, and fretless players can have perfect intonation without looking at the fretboard constantly. I know part of it is listening and not just fretting the strings, but in a complex arrangement you can't always hear yourself clearly. Is it just mainly muscle memory? And these little prodigy kids--their hands are so tiny yet they still nail it.