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I ended up buying one of these from Alan. He was super nice to sell me one of his at a great price.
I'll try to keep this short. After putting it on the guitar and using the guitar for about 5 days I think I can confidently say that Ger nailed one thing here and that is the feel of the strings. I'm not sure what term to use to describe, but it's how taut the strings feel. Basically the high E feels as if I replaced it with 11 gauge (I use a 10 set) and low E feels, almost, as if you took the A string and tuned it to low E. These two have the most dramatic change. B string doesn't feel any different, A, D and G are also much more supple. Especially G, which is fairly easy to bend now even near the tailpiece. As far as this, it's night and day between the old and new tailpiece.
I don't feel there was any difference in volume change either way. Maybe I'll find out when I start playing with people again.
Sadly, Ger is not with us to continue working oh his innovations but I think he was most definitely onto something here. I didn't wanna comment until I had some time with the guitar and the novelty wore off but every time I pick it up and I try to approach it kinda critically and pay attention to how it feels and every time I'm amazed at the the difference. There was more ringing than my old tailpiece even though Alan glued the leather piece underneath and first few days I was super aware of it but now I don't even hear it any more, guess I just tuned it out. Eventually I'll experiment to mute it some more. But it, in my mind, without doubt affected playability in all the good ways.
Interesting! Buco, you didn't talk much about the difference in tone.
On some guitars that I built I used a height-adjustable tailpiece, which allowed one to affect both the feel (stiffness vs. suppleness) and the tone/volume (due to the load on the top).
Jimmy D'Aquisto had designed a tailpiece that lets one change the length -- to vary the string afterlength. He told me, "I can make medium strings feel like light strings" that way.
Has anyone ever tried using a "finger tailpiece" on a gypsy jazz guitar? You can adjust the height of each string individually.
These days I mostly practice late at night and use the mic and headphones so I can use backing tracks and also can play softer but hear myself. So I couldn't really judge much the change in tone or volume. A little that I played it acoustically, I didn't get a feeling that it changed either way. But that's why I'm kinda looking forward to hearing what happens, if anything, during jam whenever that happens.
What Jimmy D'Aquisto said is exactly the kind of change I'm experiencing, Especially low and high E. Just a few minutes ago I tested the suppleness of G and broke it after I bent it a whole step up from A to B from the second fret. I'd have to go back to the old tailpiece and try but don't think I'd be able to do that.