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I can hold my finger over the mic. (small hole on bottom, left of center) and it works fine. Annoying but still a temporary fix.
I just launched the voice search app again and it asked if I wanted to turn on "personalized recognition" and I said yes. The speech to text now works. You can find that setting under voice input in settings.

I just launched the voice search app again and it asked if I wanted to turn on "personalized recognition" and I said yes. The speech to text now works. You can find that setting under voice input in settings.
I can absolutely verify that voice search does not work properly on my Evo (stock, unrooted) phone after OTA update to 2.3.
Here is where it gets weird. Works fine at home, works fine in car GOING LESS THAN 25MPH! Once the car is moving more that about 25mph, the mic no longer registers voice input. I have tested it over and over and over - reset the phone, done battery pulls, everything. GPS is off, toggling on GPS does not make a difference.
How does it know???? I have no idea, but try it for yourself - I would be interested to know if anyone has the same results. This is a real deal breaker for me as I use voice to text and voice command on the road a lot.
Also, while I have not had any issue with the infamous voicemail icon getting stuck, I did notice that my wi-fi signal is not nearly as good. I have read it is because wireless N is no longer supported, but I have not been able to verify that. All I know is I do not get signal in my house in places where I used to, like my bedroom and bathroom.
Last but not least, I have noticed some 3g drop out while moving - I will be surfing and all the sudden I have no data connection and the only way to get it back is to toggle mobile data and it comes right back. Probably happened 10x yesterday on a 2 hour drive in metro area.
Right now, I am waiting for unrevoked 3.4 to come out so I can root this thing and go back to 2.2.
I rooted our phones, and made a backup of my phone and copied it to her xd card. Then "restored" her phone using my backup. Then I had to reset her phone to factory settings (not factory rom) to get rid of my personal info. Now the phone works perfectly. Prior to that I had tried a factory reset of the rom (which of course just reinstalled 2.3)
I hate to have to call BS, but a few things you claim to have done are impossible: rooting an EVO that came with 2.3, "backing up" your phone and restoring it to hers and performing a "factory reset" of a 2.3 phone.
Please don't make up things and then post them on the forum. It will only serve to confuse those new to these things and good advice will get drowned out in the noise of bad advice.
Thanks!
Couldn't have said it any better.I've the same problem. Speech to text doesn't work in loud environments or when the car is moving at all. It used to work in bars with music blasting and people yelling in the background. All the iPhoners were drooling and jealous. Google / HTC: WTF did you do??! All other instances it works. If I would have known this would happen, I'd have never updated.

I confirmed that 2.3 is not as of yet rootable. So, my wifes phone must have been updated by her after I rooted it.
If you have access to an evo 4g that is still running 2.2, I recommend you root it and create a backup of the phone and save it to a separate computer. When 2.3 root becomes available you can restore that image to your phone and get back to the good old days when your phone worked.
In my opinion, it is a great idea to keep a backup of a good system configuration as insurance no matter what. I do this with all of my pc's as well and I don't store them offsite (or at least not on that computer).