Tab2zzt is an exe utility running under dos which allow you to translate tabs to zzt music. You still have to had rythmics, but give this thing a try, I think it's worth a look. don't forget to read the tab2zzt.hlp file.
This will convert guitar tab (.tab) files to .ZZT format. It's a DOS program and gives you the options of either printing the results, dumping them to a file, or displaying them on the screen. Works very well.