Ok, a full guide:-
First, download the
soundpak you wish to extract the mp3's from.
You should now have an exe file in the place you downloaded to. Run this file and extract the soundpak to where you usually would (your sound machine directory) or to any convient location.
Next goto where you extracted it to (default location is C:\chrismoyles.net Sound Machine\soundpaks) and find the soundpak. They are named SoundPaknn.pak (where nn is a number). Rename this soundpak to SoundPaknn.zip (again, where nn is the number).
Open the zip file (it should open in an extraction program like winzip or winrar, if not you'll need to install one) and you should see a list of mp3's (0.mp3 - 11.mp3) and a pakinfo file. Highlight all the files and either drag the highlighted files to an open explorer window (or the desktop) or click on the extract button and choose where to extract to.
You should now have the mp3's (and the pakinfo file if you extracted that too) in the location of your choice. Simple go through each one until you get the one you want.