Here you go:
This app, Volume Control, lets you slide your finger across the edge of the screen and it'll increase/decrease your volume no matter what app you're using.
Go to Settings-->More-->Applications-->All Applications-->Amazon Kindle
Then press "Clear Data" and "Uninstall Updates"
See if that works for you.
If that does not work, I uploaded the original Amazon Kindle Fire Books app(v184.108.40.206) to Dropbo...
Now you can use a external microphone with the Kindle Fire!
EDIT: This does NOT work with any calling apps(Google Voice, Skype, etc.) or text-to-speech apps. This will only work with a FEW audio recording apps.
For this to work you ...
This happens if you downloaded the Amazon Kindle App from the Android Market.
When you download the Android Market version it overwrites the stock version without saving your data.
The fix for this is simple.
Go to Settings-->More-->Applicatio...
Adobe Flash Player v11 seems to be having problems with the Kindle Fire.
So what you need to do is downgrade your Adobe Flash Player to the LATEST version of v10 (there'll be less bugs that way).
The latest version of v10 is Adobe Flash Player 1...