^ I had tried a couple of different files (mp3's) and all showed this problem. SO If figured it was a kindle problem. But nevertheless I decided to fire up audacity and amplify that volume on gobletoffire.mp3. and it worked! It is now audible. Thanks much
Exact Steps for the googlers

if the volume on the kindle is too low)
1. download install audacity
2. open teh target mp3
3. select all (ctrl+a)
4. effects > amplify
5. slide the slidebar to the right > check the checkbox
6. hit ok
7. file menu > and export as mp3
This new mp3 should be loud enough on the kindle.