Oh boy! Here we go again! How many threads are there on this subject already?
The answer is: if you hear a difference, they make a difference. If you don't hear a difference, they don't.
Theoretically, at least, bone pins should enhance the production of harmonic overtones in your acoustic. Fossilized walrus jawbone will slightly enhance that to a greater degree. Fossilized mammoth ivory to a still greater degree and fossilized walrus ivory to an even greater degree. Hardwood pins, like ebony and snakewood should have the opposite effect, enhancing undertone production, thus making your guitar's basses sound deeper.
Some people hear these differences; some people don't. I think it's pretty much a matter of what make guitar you're playing. Of course, if you do most of your playing plugged-in all bets are off, since your sound is determined by the signal your pickup generates.
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