I have never used email or replied to any of these strings or whatever they are called, but here I go. I used to experience the sound that ya'll are talking about until I sound proofed the string tracker unit. First, the string spool fits loosely within the unit and tends to make noise when the bow is moved. A small piece of cloth (about 1 to 1 1/2 inch circle of old sock) placed behind the spool within the unit closest to the riser will eliminate that noise and reduce the noice discussed. I also duck taped the unit to the bottom portion of my side quiver on my BW PSA since that bow doesn't have a stabilizer insert. I think the extra tape (camo flavor please) helps to insulate the unit. I just bought a Bob Lee Classic elite with a stabilizer insert and plan to check that theory. Otherwise, I love the unit and it makes tracking a breeze. I do keep my shot under 15 yards, and I do have to bare shaft eache GT arrow, then make sure each arrow with my BH shoots perfect, and then shoot each arrow with BH using the string tracker. (I'm fealing a bit anal, but its worth it). My only concern is that I'm addicted to the system and that they may quit making the replacement spools.