Hi ! My bass has really large and high shoulders, it is violin-shaped. I have no problem playing the first thumb positions, on the g string, up to d. I am having a hard time getting any higher besause the shoulder is in the way ! Is there any technique that would be useful in this case ?? I played a friend's upright bass the other day, and it is gamba-shaped... The smaller shoulders were okay, and I played up to the second octave... Is this a technique problem or an instrument problem ??