> At the risk of repeating myself, how does one tune a back, (or a front), > duplex? What is the procedure should one of want to try it? > > -- Geoff Sykes No associated risk whatsoever. You have positively and irrevocably repeated yourself. In the negative presence of other responses, I'll give it a shot. What the heck, right? First, most front duplexes are defined by mounds cast into the plate, and tuning them will require more guts and a bigger hammer than I possess. In the unlikely event that I were to attempt tuning the rare movable front duplex, I'd pluck segments, and whack the aliquot with a hammer and punch until I was satisfied that tuning had been achieved, or was convinced that I couldn't do it. Same with the rear duplex. Complicating the tuning of rear duplexes is the gang cast aliquot bar, with non-adjustable spacing between unisons. When the pianos featuring these bars have C-8 measurements ranging from 47-mm to 53+, the fixed unison duplex spacing of the aliquot bars doesn't fit with much of anything. Again, I'd whack the bars around until I was either convinced that I'd tuned them, or convinced that I couldn't. Claims ranging from enhanced tuning results, to 300%+ increase in sustain times have been made in the past for the tuning of gang cast rear duplexes. Some doubt lingers. Let us know how it works out for you. Ron N
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