You put the bow somewhat out of tune when you use the fixed crawl, so it doesn't surprise me that it gets louder. As Paul mentioned above, you would need to be able to adjust tiller to correct this. I tried the fixed crawl, but since I want to shoot 3D tournaments, I raised my anchor instead. Works about as well for me, without the extra noise, and qualifies under the 3D rules. Takes some practice to get used to.