Inspite of your personal cynicism, it happens, has been noted in the field of luthery for centuries, and it happens in solid body instruments as well, it just takes longer and is perhaps too subtle for you to catch. As the instrument is played, it gets better - period. Just like a baseball glove gets 'broken in', and works better because of it, so does a wood instrument. Do you think all those vibrations travelling through the porous woods have NO effect...?
Some old instruments are...
Brilliant description...
It is at the heart of the art of lutherie. Violin builders have known it for centuries. Why would a larger, thicker piece of wood not be susceptible to it? It is just a little too subtle for some people to pick up on, likely the same players who are allergic to 'treble', because it is in the high frequencies that the most notable change takes place. The bass is affected, as well, but it is much more subtle. If you play your bass from 2-10 hours a day like I do, you'll notice the gradual changes in your instrument.
You have every right to stand up and defend your own ignorance, if you like; if not, these links might help you get started on the path to knowledge:
http://www.luth.org/
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One quote from a prominent luthier, regarding classical guitars:
"Each instrument I build takes its own way, its own life. Its maturing process is defined a great deal by the person playing it. For some, the growth of sound is very rapid- they know how to articulate their lines and bring out the full sound of the instrument- these guitars will mature more quickly; In any case, it takes one to two years for a guitar to mature to its full sonority."
At least. Some classical guitars are 'spent' after ten years - all of their 'good sound' is gone, most notably those with Cedar tops. Spruce tops take many years to develope.
The same process happens in a well-made electric bass; it is subtle, and takes a long time, but it happens.
Nope. You are simply wrong. The process happens with silver and gold flutes, with brass trumpets, with pianos, with violins, guitars, acoustic basses, pipas, er-hu's, and it happens with electric basses. At some level, our instrument IS an acoustic instrument, it is just a very quiet one.
I practice all my scales and technique acoustically every day. And hour or two at LEAST, with my instrument unplugged. It's quite easy to notice the differences this way. Those differences translate when you plug it in. And those differences greatly diminish with the amounts of goopey, shiny crap applied to the body and neck, which is why finishes on acoustic instruments have been experimented with and studied for CENTURIES.
THE leading exponent of these ancient practices as they apply to the field of electric bass is Michael Tobias, whose instruments sound AS CLOSE to an acoustic instrument as you can get. His instruments let the woods speak, because of his wood choices, the thicknesses, and what he finishes them with. If you put a thick coat of car paint on them, all chances of any changes taking place are ruined.
I can tell this thread will get increasingly boneheaded and cynical, so I'm outta here.
Good luck,
Cameron