Jeff asks: How much difference in tension can the separate strings of a unison tolerate before you get some funky stuff going on in the partials? How do you know without taking off the couplers how far apart those strings actually are? >>>>>>>>>>>>> I've used these with varying success. I especially like the newer applications that Alan wrote about. To explain the effect, it seems to reduce the amplitude of the beating between mismatched strings- not make them in tune. As you move one of the strings it is possible to hear when the two strings match up. For me, it is a lot like working with false beating - searching for the "best" spot to leave the string. I've been happy with the full install I did in one of our piano labs and in the choir room that gets the most use. (both grands) I ended up removing them from a Steinway upright in a church. It went from being hard to tune, to being a nightmare to tune.... though the couplers kept it sounding in tune longer.... For a full install, it takes listening and tuning in a slightly different manner than I am used to. But placement up at the agraffe hasn't presented any of the difficulties I found with the placement near the bridge. Ron Koval Concordia U Curie Performing Arts Center
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