As you know, when you play the musical saw you bend it in an S-shape and bow the lower curve with your bow. But the exact contact point changes depending on the note you are playing. The higher the note, the higher up the saw you play. This was always hit or miss for me, until I played with my eyes closed. When I shut my eyes, I could see where the sound was coming from, and bowed the saw at that point, and it was right every time.