you all know it - its pretty cool for free! Look for the link to download free acid xpress
and you need some loops - 8packs. Find the link in the 'quick links' area - top right of the screen.
But beware! the free acid xpress won't create mp3 files! it will save project files and create other files though (eg lo quality real media). To create other file formats useful for making music cd's and mp3 files for the web, you can partner it with audacity (see below).
cartoon digital story telling?
Visit gnomz for a cool interactive digital storytelling engine. Running inside your browser, you pick cartoon characters then fill in the speech bubbles, then print out or email your cartoon to a friend.
Check it out!
another amazing free sound program - audacity
This program is great to creating your own loops, and also for making mp3 files from the free acid xpress.
audacity is open source, which means anyone can use it, share it, even edit it to add functionality to the program itself, then share their improvements back with all the users.