Thank you Ed, also very helpful. Aart On Jan 31, 2006, at 10:42 PM, A440A@aol.com wrote: > Susan writes: > > << Take out the last mute, and see what happens to the > > unison and its timbre, when played normally. Often it starts to sound > > crummy. Pluck the fourth string to be sure it isn't out in left field, > and > > then move it a very short distance up and down, until the unison rings > > sweetly again. The timbre of the unison > > determines where the fourth string is tuned, not its exact pitch, but > it > > should be close to the others. << > > Greetings, > I have found that the Bluther's extra string gives me the best > results > when it is tuned just slightly flatter than the unison. I think it is > because > of the phase interaction, operating through the Weinreich-described > coupling > at the bridge, produces more sustain. > When the frequency of the impelling force (the unison) is lower > than the > resonant period of the structure upon which it is acting, (the fourth > string), the two will always be in phase. If the impelling frequency > is higher, the > two will be out of phase. It is this out of phase arrangement that > augments > sustain. > Think of pushing a swing; if the swing takes 5 seconds to go > out and > return, and you give it a push every 5.1 seconds, you will always be > helping it > go away from you. If you push it ever 4.9 seconds, you will be > resisting it > every cycle. By creating this micro-resistance between the unison and > the > sympathetic fourth string, I believe that it takes longer for the > unison's energy > to pass through the bridge, thus more sustain. > If I tune the fourth string higher, the tone seems to be more > brilliant > or louder, but of shorter duration. > Just a thought, > Regards, > Ed Foote > _______________________________________________ > Pianotech list info: https://www.moypiano.com/resources/#archives >
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