Yes, it can be turned off, but to save my life I can't remember how. I tried it once, last summer, and spent way too long poking around in menus looking for the STFU option. It's in there somewhere. Until someone who actually knows what they're talking about answers, just do like I did: look through the menu options and try things until something makes it stop. (incidentally, I found that audio playback goes through the battery faster than plain reading).
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