This great plugin allows you to change the pitch and tempo in real-time, (similar to Quicktime), except on a GNU/Linux box. The main site is just a git repo, but this Ubuntu Forums post talks about it:
Here are the instructions on how to build it:
Here is the GIT page:
I will be using this for my transcriptions :)
With a little side of applesauce...
©2006 Shannon Eric Peevey