Try www.pgmusic.com. They put out Band in a Box and The Jazz Guitarist
programs.
They have some free downloads, but you have to have the basic program already
installed and the hardware to go with it (a midi and a sequensor). I've been
using the
program for two years now and have put over 400 tunes into it. There are
limitations,
some of which I've learned to get around such as voicings. The Jazz
guitarist program
has about thirty tunes in it already played back by a fairly competent
guitarist. With the
program you can view a guitar fingerboard and see the notes and chords as
they are
formed or played on the guitar. A great teaching aid for advanced students!
Flip