Larrivee ทำ compound radius fretboard มาตั้งแต่ยุค 1970s แล้วครับ
"The inlay pieces are then glued in, and the guitar is "Railed". Railing is the process by which we provide a curvature to the fretboard. Our railer uses a CNC cut platen which has a compound radius cut into it. Our radius starts at about 16" at the nut and ends at around 20"- 21". This creates a flatter fingerboard as you play down it. As far as we know, we are the only major guitar company to use a compound radius on our instruments. It is not traditionally done anymore because of the large amount of skill and labor involved to perfect it. The difference between a standard even number radius and a compound radius are immediately felt though - The fretboard of a guitar with a compound radius often feels more comfortable, and is easier to play in the higher frets."
