I did have an (agraffe) buzz I chased all over a new piano I was prepping without success eliminating it. Then as part of my tuning stabilization, I lifted the strings. Voila, the loud buzz was cured. Heard another softer buzz and found another string buzzing in its agraffe. Grabbed it with the string hook and swung it back and forth and eliminated it. If you can isolate a buzz to a string it most definitely is in the termination at the agraffe/capo. This was an a new Heintzman, much better than average chinese fair but it did have these issues. Andrew Anderson
This PTG archive page provided courtesy of Moy Piano Service, LLC