Well I can now say that Heterodyning for string silencers definitely works. My 64" Mesa was god-awful loud when I first got it (possibly also worsened by having a fast flight string on it). I got to practice for the first time in about a month last evening, and the first time with string silencers put on. On my 61" string I put the lower silencer at 20" and the top silencer at 15", and it is an absolute night and day difference. I was a little skeptical at first about how well this would work, but its dead quiet now and I am super pleased. I did put on my bow quiver at the same time as the silencers so that may have helped dampen some vibrations as well. Just wanted to post for anyone else who may be curious about it, Its definitely a good option!