Accessibility Alt Text problem

I have an acronym in the PDF and want to create alternate text for it. I believe I understand the procedure to do so. I'm using the Read Out Loud feature in Acrobat Pro 9 to test it. The reader reads the alternate text first , but then it also reads the acronym itself. It's like an echo, except that the alt text reading is correct, and the second reading of the acronym is incorrect pronounciation.
Instructions in the help menu and on the web are very scimpy. I sure hope that someone can help with this.

Jay,
Here's an overview —
(1) Screen capture of an acronym in the text flow.
(2) Screen capture depicting use of Alternate Text.
(3) Screen capture depicting use of Expansion Text.
(4) Screen capture of PDF export to accessible text.
And, on to a synopsis of "breaking out" the pesky acronym.
"Break'n out" the acronym.
Open the Tags panel. Locate the container ('box') for the text string containing the acronym.
Now, New Tags must be made. In my example the string is content tagged by <Body> (which role maps to <P>).
The <Span> is a grouping element.
I added two <Span> tags. One is placed above and one below the original <Span> tag.
Next, selecting the Container 'holding' the text string I used the menu to Delete Tag.
On the PDF page the Select Tool is used to select the text string "Some text that, " (note that the space is included).
With focus back on the Tags panel and the first of the 3 <Span> tags selected "Create Tag from Selection" (on the Options menu). A Container with the selected text is now under this first <Span> tag. Repeat for the text string "BTW, " (again, include the space). Move focus to the Tags panel and select the 2nd <Span> tag then "Create Tag from Selection". Do this all again for the remaining text.
Now there are 3 in-line 'steps' under the <Body> tag which 'breaks out' the acronym.
With this the text string that is the acronym can be given Expansion Text.
Select the Container having the acronym. From the Options menu select Properties.
In the Properties dialog select the Content tab. Spell out the acronym in the Expansion Text field then tab out of the field to "set" the entry. Close the Properties dialog. Save As.
Okay, one acronym down! Now, we do it again, and again, and ....
Be well...

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If you are here about "alt" text, first read any of the posts explaining that "alt" text isn't supposed to appear, it's just a quirk of IE that it sometimes does, FF4 is correct and does what the standards ask and what other browsers do. You want "title" text. The best explanation seems to be:
https://support.mozilla.com/en-US/questions/804893
If you have the Google Toolbar installed, turn it off and see if you get them back. This is a known issue, eg:
http://support.mozilla.com/en-US/questions/740139
See also:
https://support.mozilla.com/en-US/questions/803441
https://support.mozilla.com/en-US/questions/775410
https://support.mozilla.com/en-US/questions/802284
https://support.mozilla.com/en-US/questions/751043
Now, still not getting tooltip popups for here or here?
http://www.xkcd.com/
http://www.asofterworld.com/
Neither was I. I *did* get them in safe mode, but I did a lot of resetting and mucking about without any luck. In the end, after doing a text diff between safe mode and not, of the Troubleshooting information (in the Help menu), I found that the issue might be Direct2D-related, and changed the flag "gfx.direct2d.disabled" to true in about:config. I now have tooltips back but a less efficient FF4.
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